Motherboard does not POST

[benwood]

I'm building a HTPC with a Pentium 4 3.2ghz Northwood CPU, two 512meg
sticks of Mushkin PC3200 ram, Zalman CNPS 7000-A AlCu heatsink, Arctic
Silver Ceramique thermal compound, and a Intel 865 PERL motherboard. The
power supply I'm using is a 400w Seasonic Super Silencer. When I 1st
powered the computer the heatsink fan started up and I got a very rapid
series of beeps. I thought the problem might be caused by CPU as the
Intel 865 PERL instruction manual stated that seven beeps indicates a
CPU problem though there seemed to be more than seven beeps sounded in
the attempt to boot.

So I removed the motherboard and power supply from the case, removed the
heatsink and CPU, cleaned off the old thermal compound with 91%
isopropyl alcohol and reapplied a new coat os thermal compound. I also
removed and reinstalled the two sticks of Mushkin RAM. I left the
motherboard out of the case, jumpered the off/on pins on the motherboard
and reconnected the power cables.

Now when I try to boot the system I no longer get any beeps. Instead
after about 5-7 seconds the fan on the heatsink stops spinning. I've
tried attaching a video card but the machine never gets far enough along
to output video. Any idea as to what's wrong. I hope I havent fried by
motherboard or CPU. Thanks. 🙁

 

[qbackin]

What is your psu? And the rating on the 12v rail?

 

[IEC]

Originally posted by: qbackin
What is your psu? And the rating on the 12v rail?

If you read the OP you will see it's a Seasonic 400W which is PLENTY. 😉

 

[imported_Kensai]

Did you short out the motherboard?

 

[Peter]

You know that the power-button connector is for a MOMENTARY button not a PERMANENT switch? If you "hold" the connection for five seconds, the hardware is going to switch everything back off.

 

[lenjack]

Why blame the mobo? It could be another component.

 

[Jayczar]

check the CPU for a possible bent pin and try one stick of RAM.

 

[benwood]

My thanks to qbackin, ariafrost, Kensai, lenjack, Jayczar and especially Peter for their help. The problem was caused by me jumpering the on/off pins on the motherboard. When I removed the jumper the motherboard POSTed.