On model B+ (and presumably also the A+), the circuit has been improved to give a much more reliable warning of poor power quality. ![]() If it is blinking, as one user has reported it means the 5V power supply is dropping out. On model A and B, it is hard-wired to the 3.3V power supply rail. Red power LED does not light, nothing on displayĪ blinking red power LED indicates problems with the power supply. See the next sections for how to interpret other statuses. On when connection is 100 Mbps off when 10 Mbps On when Ethernet connection is full duplex Steady ON when Pi receives some power on original B and A, but since the B+ (except for the zero) the PWR LED is also a power good indicator that goes off when power drops below 4.65V There are five LEDS near the USB connector. Note that the Pi has no BIOS, so nothing will be displayed on screen unless the Pi successfully boots! For more information see #Troubleshooting_power_problems. A 5 volt 2 amp power supply can help some wifi USB adapters run more stable. Ī good power supply that will supply 5 volts and at least 1 amp (5V 1A) is vital. Note: if you have any kind of booting problems, start off by reading the "Is your Pi not booting? (The Boot Problems Sticky)" in the troubleshooting section of the Official Raspberry PI forum. 8.10 Composite displays only black and white image.8.7 Interference visible on a HDMI or DVI monitor.8.6 Writing spills off the screen on HD monitors.8.5 Big black borders around small image on HD monitors.8.4 Can only get 800x480 resolution in LXDE (Arch linux).8.3 Video does not play or plays very slowly.7.3 Sound does not work at all, or in some applications.7.1 Sound does not work with an HDMI monitor.6.2 Some programs refuse to accept my password.6.1 I do not know the password to login.5.7 Network connection fails when a Graphical User Interface is being used.5.6 Crashes occur with high network load.5.5 Networking no longer works when changing SD card between two Raspberry Pis.5.4 Network/USB chip gets too hot to touch.5.2 Ethernet connects at 10M instead of 100M.5.1 Ethernet connection is lost when a USB device is plugged in.3.3 Choosing the right ARM/GPU memory split.2.6 No USB device works, with known good PS, SD card, KB.2.4 Re-mapping the keyboard with Debian Squeeze.2.2 Keyboard / Mouse interferes with USB WiFi device.2.1 R-Pi does not respond to key presses / Keyboard randomly repeats key presses. ![]() 2 Keyboard / Mouse / Input Devices / Webcams.1.8 Raspberry Pi shuts down (or restarts) soon after booting up.1.5 Green LED blinks in a specific pattern.1.4 Red power LED is on, green LED does not flash, nothing on display.1.2 Red power LED does not light, nothing on display.
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