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Newish motherboards all turn off automatically if they don't get information from CPUFAN (most of the time CPUFAN1) make sure you always plug your heatsink into this power slot on the motherboard instead of SYSFAN or AUXFAN or any other power connection. Sometimes CPUFAN isn't the closest one to the socket.
Symptoms of this are basically the computer turns on for 1-3 seconds and either beeps extremely fast or (most often) just turns back off.
I would sticky this, but we have something very similar already.
colinJohn wrote:that's a nasty - I do mention it under power supply at the end but probably worth moving it up as I guess ia PSU could be shipped in the the wrong position.
I've never tried (I'm UK) - what happens if a 120V supply is fed into a 240V switched PSU? Any damage or just nothing? any LEDs, any fans?
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