R-Pi Troubleshooting

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This page lists the most common problems and suggests some solutions.

Power / Start-up
A good power supply that will supply 5V is vital. There is more information about power supplies and troubleshooting.

Red power LED does not light, nothing on display
The power is not properly connected.

Red power LED is on, green LED does not flash, nothing on display
The Raspberry Pi cannot find a valid image on the SD card. Check that you have correctly written a Raspberry Pi image to the card. See also, Known SD Cards.

Raspberry Pi shuts down soon after booting up
This is caused by a power supply with too low voltage or too high voltage.

Keyboard randomly repeats key presses
This is caused by inadequate power. Use a good power supply and a good power cable. Some USB devices require a lot of power, most will have the voltage and mAh on the back of them, they should be 5v 100mAh each max, any more than this they must be used with a powered USB hub. Try unplugging every USB device except the keyboard (you should also note that some keyboards have built in hubs and can try to draw 1500mAh (Pi can only handle 100mAh per USB slot without a hub)).

General / Formatting
If you are having problems setting up your memory card you might want to try erasing it completely - especially if it has been used elsewhere and still contains data / partitions. Windows and Mac users can download a formatting tool from the SD Association: https://www.sdcard.org/downloads/formatter_3/

Ethernet connection is lost when a USB device is plugged in
This is caused by inadequate power. Use a good power supply and a good power cable. Some USB devices require a lot of power, so they must be used with a powered USB hub. Some cheap USB hubs suck power from the Raspberry Pi even if a USB power supply is connected.

Sound does not work
Device drivers for sound are still being developed. Please wait for the community to improve the situation.

Video does not play or plays very slowly
Device drivers for video are still being developed. The XMBC distribution is the only distribution with good video support at the moment. Please wait for the community to improve the situation.

Can only get 800x480 resolution in LXDE (Arch linux)
Known issue with distro package as of 17-Apri-2012 - there's some missing boot config info. Creating a suitable cmdline.txt fixes it - type the following at the Raspberry Pi command line:

sudo echo "dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 root=/dev/mmcblk0p2 rootfstype=ext3 rootwait" >/boot/cmdline.txt

GPIO
To be added.

Troubleshooting power problems
If you think you have a problem with your power supply, it is a good idea to check the actual voltage on the Raspberry Pi circuit board. Two test points labelled TP1 and TP2 are provided on the circuit board to facilitate voltage measurements.

Use a multimeter which is set to the range 20 volts DC (or 20v =). You should see a voltage between 4.75 and 5.25 volts. Anything outside this range indicates that you have a problem with your power supply or your power cable.