Note: A faintly glowing steady green LED means no boot code has ever been executed, as almost the first thing the boot code does is to turn the faint glow off! When flashing/blinking the green LED should be as bright as the red LED. ![]() Start off by reading the "Is your Pi not booting? (The Boot Problems Sticky)" in the troubleshooting section of the Official Raspberry PI forum it contains the latest info about "Red power LED is on, green LED does not flash" kind of problems. Red power LED is on, green LED does not flash, nothing on display Check your connections, cable, and power supply. The red power LED is wired to an APX803 supervisor which kicks in when the 5V power supply drops below 4.63V. ![]() 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. ![]()
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