PC boots up then shuts off. Cooling problem or something?

[Assassin X]

I had fixed my fiancees computer, replaced a dead Sata cord on HD, added video card and added 450 watt power supply.

 

Well it worked fine until today when I added 3 fans and an new CPU heatsink/cooler. Now when I turn on the computer it stays on for generally under 5 seconds then turns off. Whats going on? I checked the cords but can't figure it out! Is there not enough power for the computer now? Do the fans/cpu cooler take that much power???

 

Her PC stats are:

-450 Watt Supply

-P4 3.2GHZ

-512 Ram

-ATI HD3650 AGP

-Basic Sound Card

-Win Xp (SP2)

-1 WD 140 Gig HD

-2 Basic Dell DVD Burners

-3 80MM Fans

-Basic 80mm Cooler/Heatsink for CPU

[TheMumm]

try unplugging the fans and see if it still shuts off.

[Stachman31]

Maybe also check that the CPU heatsink is pretty snug. Sometimes if the coolers have the plastic push pins, they sometimes wiggle loose, even on a new installation.

[Assassin X]

Yep, it wasn't snugly on there. Turns out the plastic frame had to be replaced that you screw on the motherboard (along CPU) in order for the Heatsink to grasp it right. I never knew those could be replaced. Learn something new everyday! Now it fits snuggly on the new one.

 

Computers still is a little slow. Maybe its just because I am not use to an older PC. Mine is a quad core beast compared to her 3.2 ghz P4. lol. For instance I click a WMP and it takes about 6 seconds to load. On my pc it loads instantly.