When power applied to CPU - system shuts down

[MrNelsonB]

I'm trying to fix a friend's Thermaltake WingRs computer. The motherboard is a PCI Express ata100 p17g. When turning it on, the fans spin for a few seconds and then shuts down. First I blew out all the dust in the case. Next I tried the paperclip power supply test and the PS works. Finally tried unplugging everything from the motherboard. The MB will power up with everything connected (HD,CDW, fans) UNTIL I plug in #20 (4-pin +12V) power connector for the CPU. When I plug in #20 I see a small spark and the system shuts down. I'm assuming this shows a short somewhere in the MB, right? I checked the voltage to see if the PS was sending too much and it shows 12.11 volts. So what would you suggest as a next step?

 

[jbaker22]

I would suggest you never plug in a component while the power supply is on. That fries components. Are you saying it boots when you don't have the 4 pin connector plugged in? What is the motherboard model?

 

[MrNelsonB]

Right now I'm trying to get the unit to stay on. With all connections removed from the MB (except CPU fan and front panel switch) when powered up the CPU & power supply fans both come on and stay on. When I turn the unit off & connect the 4 pin connector the MB only stays on for a few seconds. If I carefully connect the 4 pin connector while the unit is on, then it shuts off. The MB is PCI Express ATA 100 P17G/1333 V1.0a That's the only writing I see on the board that relates to a model number.

 

[jbaker22]

I see you are trying to keep an old Pentium 4 / core 2 duo alive. I would recommend buying a new motherboard for $11 lga 775 motherboards are pretty common. If you want help upgrading, just give me a price point.

 

[MrNelsonB]

I'll let him know to see what he wants to do. Appreciate your input and answers. Did you mean the LGA 775 MB's are $11?
Where did you see them at that price? Just wondering

 

[jbaker22]

It is technically $11.04 with free shipping. If you want a different shaped mobo this is a $12.74 free shipping too.

$11: http://www.ebay.com/itm/HP-Compaq-DC5800-SFF-461536-001-450667-001-Motherboard-Intel-Socket-LGA775-/111312763777?hash=item19eac1fb81:g:U8IAAOSwEK9UCgRk


$12: http://www.ebay.com/itm/Dell-Precision-Workstation-LGA775-TP412-0TP412-Motherboard-/121292865763?hash=item1c3d9e40e3:g:YN8AAMXQlgtSzvvq