CPU not booting - no POST message

[DLam]

I'm trying to build my first computer. It booted the first time and I went into bios to change the boot from floppy to CD-ROM. I rebooted with Windows XP in the DVD drive and it began loading. However, it stalled and gave me a message that loading is stopped to prevent "damage to the computer", something along those lines, I don't remember exactly what it said. I rebooted it and the post message was "system failed due to overclocking". I turned it off and on again
but now it won't even beep and I can't get into bios. I took out the mobo, like an earlier thread suggested, and powered up just with the mobo + cpu + 1 stick of RAM but I still can't get it to beep.
Anybody has any thoughts on what's fried and how to go around fixing it?

These are the components (all new): Asus A7N8X-E Dlx, Athlon XP-M 2500, TT Purepower 420W PSU, Corsair 512mb 3200 LLPT RAM. Other hardware that I put together in the case: ATI 9700 Pro, Sony DVDROM, Nec 2500 DVDRW, Seagate 120gb ATA HD (and no floppy drive).

I don't understand the "overclocking" message because everything was set at default (except the boot drive).
Edit: The CPU fan works upon power up and I'm using Thermalright ALX-800 with Arctic silver 5 TIM.

 

[minendo]

Reset cmos using the jumper.

 

[DLam]

I just cleared the CMOS. It didn't make any difference. Still the fan spinning round and round, but nothing else.

 

[minendo]

Originally posted by: DLam
I just cleared the CMOS. It didn't make any difference. Still the fan spinning round and round, but nothing else.

Reseat the motherboard to ensure it is not shorting out.

 

[DLam]

Yah, I have it sitting on an antistatic bag, outside the case, on the table. I thought it was a short too, so I took it out. I'm beginning to think that the chip or the mobo is fried, but before I take drastic (and expensive) measures , I wanna be able to rule everything out.

 

[minendo]

With no beep codes, I would lean towards it being a mobo issue.