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The M3 ATX PSU has an on board LED situated in the bottom-middle side
of the jumper block. This LED will show different status of the PSU i.e.: low power
mode, power up timeout, VIN too low / too high, Hard OFF Delay, standby ON or
recovery mode.
Two short blinks in every 20 seconds -Low Power Mode
Three burst of very fast LED blinking - Start up delay
Slow blinking (~1sec period) - Standby (only 5VSB is ON)
Constant light - All rails ON, PSU runs normally
Two short flashing in 20 second - Hard OFF mode
Fast blinking in normal running mode - V(in) to low / to high
Fast blinking in recovery mode - System variables recovered
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