Having spent an afternoon trying to solve this problem I gather it is a fairly common problem but it is DRIVING ME MAD!!!
From the beginning:
I am building a new PC with the following:
Asus P5LD2-VM DH motherboard
Intel (775) Pentium 4 3.4 GHz processor
512MB DDR2 RAM
600W EZCool power supply
(The rest is irrelevant because I can't get it to POST so far!)
When I power on, the CPU fan spins for about 1 second and then stops, the motherboard power light remains on at all times.
Now for the interesting part:
I have tried the CPU, power supply and memory with another motherboard (Asus P5B) and sometimes the same problem occurs but sometimes it does seem to boot up - the problem is that with this motherboard (which doesn't have onboard graphics) as soon as I plug in a PCI-E graphics card the CPU fan spins for one second and then stops!
I have tried a different power supply, different memory with both motherboards and seem to be getting the same problem. The only thing that I haven't replaced is the CPU and CPU fan.
I have taken the motherboard out of the case (to check for shorts), reset the CMOS and STILL the problem persists.
Does anyone have any ideas? I don't want to have to buy a new CPU unless I know for certain it is that (I have spent a fortune on this already!!)
It is a PC for my boss so 500 points to whoever helps me fix it!