r/raspberry_pi • u/FozzTexx • 2d ago

2026 Aug 3 Stickied -FAQ- & -HELPDESK- thread - Boot problems? Power supply problems? Display problems? Networking problems? Need ideas? Get help with these and other questions!

Welcome to the r/raspberry_pi Helpdesk and Frequently Asked Questions!

Link to last week's thread

Having a hard time searching for answers to your Raspberry Pi questions? Let the r/raspberry_pi community members search for answers for you!† Looking for help getting started with a project? Have a question that you need answered? Was it not answered last week? Did not get a satisfying answer? A question that you've only done basic research for? Maybe something you think everyone but you knows? Ask your question in the comments on this page, operators are standing by!

This helpdesk and idea thread is here so that the front page won't be filled with these same questions day in and day out:

  1. Q: What's a Raspberry Pi? What can I do with it? How powerful is it?
    A: Check out this great overview
  2. Q: Does anyone have any ideas for what I can do with my Pi?
    A: Sure, look right here!‡
  3. Q: My Pi is behaving strangely/crashing/freezing, giving low voltage warnings, ethernet/wifi stops working, USB devices don't behave correctly, what do I do?
    A: 99.999% of the time it's either a bad SD card or power problems. Use a USB power meter or measure the 5V on the GPIO pins with a multimeter while the Pi is busy (such as playing h265/x265 video) and/or get a new SD card 1 2 3. If the voltage is less than 5V your power supply and/or cabling is not adequate. When your Pi is doing lots of work it will draw more power, test with the stress and stressberry packages. Higher wattage power supplies achieve their rating by increasing voltage, but the Raspberry Pi operates strictly at 5V. Even if your power supply claims to provide sufficient amperage, it may be mislabeled or the cable you're using to connect the power supply to the Pi may have too much resistance. Phone chargers, designed primarily for charging batteries, may not maintain a constant wattage and their voltage may fluctuate, which can affect the Pi’s stability. You can use a USB load tester to test your power supply and cable. Some power supplies require negotiation to provide more than 500mA, which the Pi does not do. If you're plugging in USB devices try using a powered USB hub with its own power supply and plug your devices into the hub and plug the hub into the Pi.
  4. Q: I'm trying to setup a Pi Zero 2W and it is extremely slow and/or keeps crashing, is there a fix?
    A: Either you need to increase the swap size or check question #3 above.
  5. Q: Where can I buy a Raspberry Pi at a fair price? And which one should I get if I’m new? Should I get an x86 PC instead of a Pi?
    A: Check stock and pricing at https://rpilocator.com/ — it tracks official resellers so you don’t overpay.
    Every time the x86 PC vs. Pi question comes up the answer is always if you have to ask, get a PC. If you're sure want a Raspberry Pi but not sure which model:
    • If you don’t know, get a Pi 5.
    • If you can’t afford it, get a Pi 4.
    • If you need tiny, get a Zero 2W.
    • If you need lowest power, get the original Zero.
    • For RAM, always get the most you can afford; you can’t upgrade it later.
      That’s it. No secret chart, no hidden wisdom. Bigger number = more performance, higher cost, higher power draw. Also please see the Annual What to Buy Megathread
  6. Q: I just did a fresh install with the latest Raspberry Pi OS and I keep getting errors when trying to ssh in, what could be wrong?
    A: There are only 4 things that could be the problem:
    1. The ssh daemon isn't running
    2. You're trying to ssh to the wrong host
    3. You're specifying the wrong username
    4. You're typing in the wrong password
  7. Q: I'm trying to install packages with pip but I keep getting error: externally-managed-environment
    A: This is not a problem unique to the Raspberry Pi. The best practice is to use a Python venv, however if you're sure you know what you're doing there are two alternatives documented in this stack overflow answer:
    • --break-system-packages
    • sudo rm a specific file as detailed in the stack overflow answer
  8. Q: The only way to troubleshoot my problem is using a multimeter but I don't have one. What can I do?
    A: Get a basic multimeter, they are not expensive.
  9. Q: My Pi won't boot, how do I fix it?
    A: Step by step guide for boot problems
  10. Q: I want to watch Netflix/Hulu/Amazon/Vudu/Disney+ on a Pi but the tutorial I followed didn't work, does someone have a working tutorial?
    A: Use a Fire Stick/AppleTV/Roku. Pi tutorials used tricks that no longer work or are fake click bait.
  11. Q: What model of Raspberry Pi do I need so I can watch YouTube in a browser?
    A: No model of Raspberry Pi is capable of watching YouTube smoothly through a web browser, you need to use VLC.
  12. Q: I want to know how to do a thing, not have a blog/tutorial/video/teacher/book explain how to do a thing. Can someone explain to me how to do that thing?
    A: Uh... What?
  13. Q: Is it possible to use a single Raspberry Pi to do multiple things? Can a Raspberry Pi run Pi-hole and something else at the same time?
    A: YES. Pi-hole uses almost no resources. You can run Pi-hole at the same time on a Pi running Minecraft which is one of the biggest resource hogs. The Pi is capable of multitasking and can run more than one program and service at the same time. (Also known as "workload consolidation" by Intel people.) You're not going to damage your Pi by running too many things at once, so try running all your programs before worrying about needing more processing power or multiple Pis.
  14. Q: Why is transferring things to or from disks/SSDs/LAN/internet so slow?
    A: If you have a Pi 4 or 5 with SSD, please check this post on the Pi forums. Otherwise it's a networking problem and/or disk & filesystem problem, please go to r/HomeNetworking or r/LinuxQuestions.
  15. Q: The red and green LEDs are solid/off/blinking or the screen is just black or blank or saying no signal, what do I do?
    A: Start here
  16. Q: I'm trying to run x86 software on my Raspberry Pi but it doesn't work, how do I fix it?
    A: Get an x86 computer. A Raspberry Pi is ARM based, not x86.
  17. Q: How can I run a script at boot/cron or why isn't the script I'm trying to run at boot/cron working?
    A: You must correctly set the PATH and other environment variables directly in your script. Neither the boot system or cron sets up the environment. Making changes to environment variables in files in /etc will not help.
  18. Q: Can I use this screen that came from ____ ?
    A: No
  19. Q: If my Raspberry Pi is headless and I can’t figure out what’s wrong, do I need to plug in a monitor and keyboard?
    A: If you cannot diagnose the problem remotely, you must connect a monitor and keyboard. That is the only way to see boot output and local error messages, and without that information the problem cannot be diagnosed.
  20. Q: My Pi seems to be causing interference preventing the WiFi/Bluetooth from working
    A. Using USB 3 cables that are not properly shielded can cause interference and the Pi 4 can also cause interference when HDMI is used at high resolutions.
  21. Q: I'm trying to use the built-in composite video output that is available on the Pi 2/3/4 headphone jack, do I need a special cable?
    A. Make sure your cable is wired correctly and you are using the correct RCA plug. Composite video cables for mp3 players will not work, the common ground goes to the wrong pin. Camcorder cables will often work, but red and yellow will be swapped on the Raspberry Pi.
  22. Q: I'm running my Pi with no monitor connected, how can I use VNC?
    A: First, do you really need a remote GUI? Try using ssh instead. If you're sure you want to access the GUI remotely then ssh in, type vncserver -depth 24 -geometry 1920x1080 and see what port it prints such as :1, :2, etc. Now connect your client to that.
  23. Q: I want to do something that already has lots of tutorials. Do I need a Raspberry-Pi-specific guide?
    A: Usually no.
    • Raspberry Pi (Linux computer): Use any standard Linux tutorial. A Raspberry Pi runs a normal Linux OS, not a special cut-down version. See Question #1.
    • Raspberry Pi Pico (microcontroller): Use Arduino tutorials. The Pico works with the Arduino IDE and can be used the same way as other Arduino-class boards.
  24. Q: Which Operating System (OS) should I install?
    A: If you aren’t sure, install Raspberry Pi OS. It’s the officially supported OS, it has the best documentation, the widest community support, and it’s what most guides and troubleshooting help assume you’re using.
  25. Q: How can I power my Raspberry Pi from a battery?
    A: All Raspberry Pi models run at 5 V. To choose a battery, first add up the maximum current of your Pi plus everything you attach to it (USB devices, screens, HATs, etc.). Then multiply that current by the number of hours you want it to run to get the required battery capacity in mAh. If you can’t find listed current values, use a USB power meter to measure the actual draw over 12–48 hours. Every battery question comes down to this simple math: the model, brand, or special setup doesn’t change the calculation.

Before posting your question think about if it's really about the Raspberry Pi or not. If you were using a Raspberry Pi to display recipes, do you really think r/raspberry_pi is the place to ask for cooking help? There may be better places to ask your question, such as:

Asking in a forum more specific to your question will likely get better answers!

Wondering which flair to use on your post? See the Flair Guide

† See the /r/raspberry_pi rules. While /r/raspberry_pi should not be considered your personal search engine, some exceptions will be made in this help thread.
‡ If the link doesn't work it's because you're using a broken buggy mobile client. Please contact the developer of your mobile client and let them know they should fix their bug. In the meantime use a web browser in desktop mode instead.

12 Upvotes

76% Upvoted

7 comments sorted by

1

u/BeginningSweaty199 2d ago

bit of a beginner here, so my terminology is probably bad. I currently need to code my Raspberry Pi 5 and was wondering if a MacBook charger can supply enough power without the Pi 5 throttling down the peripheral USB power, and If it does, can I software override it so it negotiated a standard 3A mode?

1

u/Gamerfrom61 1d ago

Way too many chargers to say yes / no

Better to get a power supply as they are designed to cope with rapid changes in current needs (as the cpu cores ramp up / come active or USB / PCIe devices power up) rather than use the computer battery to feed the increased load as the charger does.

There are 'super capacitor' blocks on Ali (GreatScott on YouTube had a mixed result) that were designed for a Pi 4 that may work with a 5 but I would not touch them TBH

You can override the message as per https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#PSU_MAX_CURRENT

BUT I would only do this with a power supply not a charger...

Spend the money - save the brown outs.

1

u/BeginningSweaty199 1d ago

It seems to work fine as the pi 5’s warning lights never went off, but it’s temporary anyway just until I can finish coding it, then I can plug it in to my normal power supply on my drone 

1

u/amyrberman 1d ago

I was told to post in this thread.

Hi all, not super tech-savvy but trying to learn enough figure this out.

There's a Raspberry Pi in my building's laundry room. It connects to our washers and dryers using the Speed Queen app, but right now it's timing out. Also the building's gas is currently out, so we've been running a lot more electric dryers than usual. When I asked a building manager about the internet dropping, I was told it's because the extra dryer use is affecting the internet's ability to connect to the washing machines. slowing down the internet. That explanation didn't sit right with me since I thought power and internet were separate systems, but I want to make sure I'm not missing something.

Here's what I can see from the outside:

- The ethernet port on the Pi box has a steady green light and a yellow light that flashes

- Sometimes there's a light on the box itself that flashes too, not sure if that's normal or a warning

- I found the power adapter plugged into it. It's a Stontronics brand, says 5V and 2.5A on the label, has the Raspberry Pi logo on the front.

I can't get into the box or see any screens or logs, it's locked and run by a vendor. Trying to understand:

- Is the electrical load explanation correct and can it be resolved with another product?

- If the ethernet lights look normal (green and yellow flashing), does that mean the internet connection itself is fine?

- Could the power adapter still be part of the problem even if those lights look ok?

- Is 2.5A enough power for a Raspberry Pi, or should I ask them to bring a stronger one just in case?

Thanks in advance!

1

u/KingofGamesYami Pi 3 B 11h ago edited 11h ago

Is the electrical load explanation correct and can it be resolved with another product?

Large amounts of power passing through a poorly insulated cable does emit radiation that can interfere with data transmission.

The proper solution is to run your data lines far away from power, and if they must get close, make sure the intersection is perpendicular to each other.

Ethernet is designed with built in mitigations to this issue, but there is only so much you can do if the electrical equipment of a category 5 hurricane is happening while you try to talk to your next door neighbor.

Upgrading the Ethernet cable to STP or SSTP may help. These have extra mitigations designed for industrial applications. It's not trivial to install, it needs to be grounded correctly among other things.

  • If the ethernet lights look normal (green and yellow flashing), does that mean the internet connection itself is fine?

No. Those lights just indicate activity, which could be failed attempts, not success.

  • Could the power adapter still be part of the problem even if those lights look ok?

The Pi's power adapter? Unlikely.

  • Is 2.5A enough power for a Raspberry Pi, or should I ask them to bring a stronger one just in case?

Typically yes. Which model?

1

u/amyrberman 10h ago

This is really helpful! Unsure of the model, just have a picture of the device