Why does fan spin for 1 second only? K7N2GM-1L

Hi Guys,
First post here. I have read all the stickies and FAQs, but I don't seem to have found an answer to my specific problem. If it is here, and I missed it, please just point me to it and accept my apologies ( and thanks) in advance.
I have just put in a K7N2GM-1L for a friend who was struggling. When I hit the case power switch, the CPU fan spins for about 1 second, then stops. Nothing else happens. If I reset the power switch on the PSU (i.e. set from 1 to 0 then back to 1), I can repeat this process - but nothing seems to help get the board to progress onto POST.
I have tried with and without RAM. I have tried removing the power switch cable to the board, and shorting (briefly) with a screwdriver, in case the case switch was bad (same result). I have tried with no IDE drives, all IDE drives, with and without the floppy connected. I have tried the board mounted in the case, and outside the case (on a non-conducting surface) - always the same result.
After a lot of head scratching (I normally consider myself pretty competent inside a PC case, and have installed / upgraded / fixed numerous PCs) I realised I had done something pretty dumb. I had been powering the board with the BIOS reset jumper set in the RESET position. I know, I should have checked first, but I didn't :( 
The manual says that this will *damage the board*, but does not give any further details. Does anyone know whether this is the real showstopper, or is it just a generally bad idea and there is still something else that I have not checked?
I see from many other posts that the PSU is pretty critical to these boards. I have tried two separate PSUs - both from known working systems. Specs are below.
Jeantech 400W
+5V = 35A
+3.3V = 28A
+12V1 = 15A
+12V2 = 17A
-5V = 0.3A
-12V = 0.8A
+5V SB = 2A
Jeantech 500W
+5V = 40A
+3.3V = 30A
+12V = 18A
-5V = 0.3A
-12V = 0.8A
+5V SB = 2A

Quote from: Grayone on 08-May-06, 07:50:03
Yes, having the cmos clear jumper in the wrong position can damage the motherboard.  I don't believe that it is an automatice thing to happen since I have done the same thing a time or two myself without any resulting problems
How many times did you try to start the system with the jumper set wrong?  That may give us the answer since multiple tries might have been too much for the motherboard to endure.
Can you try the pieces in another system to verify if they are all good?  If they check out, then it is probably time to request an rma on the motherboard.
It would help if you told us what other pieces are in the system: cpu-memory-video card-hard drives-optical drives-pci cards as I are just guessing now.
I'm afraid I probably started the board with the jumper in the wrong position a dozen times or so, while trying various combinations of other possible faults before I realised the jumper setting was wrong :(
The system is essentially bare at the moment - just a floppy, a stick of RAM, CPU (Athlon 1800), onboard graphics, no monitor, no PCI cards.
Just to humour me for a moment..... if we assumed that no damage was done by the CMOS jumper setting, what else might be causing the symptoms described in my post above? Any thoughts?

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