Help! Computer doesnt power up. Bad PSU? Mobo?

hAxsYn

Member
Jan 28, 2005
131
0
0
Will an Antec TruePower 2.0 550W pull a Core2Duo E6600, 2 evga 7950GT KO's (512MB) (In SLI PCI-E), Audigy2 ZS PCI, DVD-/+RW Drive, 320GB HDD SATA, pqi turbo 2GB DDR2 5400 (In Dual Chan / 2x 1GB), on an ASUS P5NSLI mobo (with 2 120mm led fans & 3 small front led accent lights)?

If not, could it be why system stopped powering up? Or is it a faulty mobo?

Initial symptoms -
First Hunch: Bad Mobo
1. Wasnt recognizing PCI/PCI-E hardware properly, had problems with detection and drivers.
2. I touched some area on the mobo with a screwdriver, lightly though, and then PC wouldnt boot. The tip of the screwdriver might have been magnetic (dumb, I know). After PC wouldnt boot - mobo only showed a green "status light", but when I pressed power - front case accent lights went on for a split second, and then went out. Pressing the power button again was useless. The only way I could reproduce the split second "ON" was to take the power plug out of the PSU and then plug it back in.
*Edit: (Tried booting w/ one 7950GT, nothing. Tried booting w/ one memory stick, nothing. Tried wiggling/re-inserting expansion cards & memory, no help)

Second Hunch: PSU Faulty
1. My 120mm fan had a hard time spinning up off of the PSU's "Fan Only" plugs. It only started spinning like 10 secs after I pushed the power button.
2. Cold cathode dimmed randomly. Once went out during installation of windows.
Strange: I tried connecting the Antec PSU to my old system. I didnt plug in all the molex plugs, just the main power 24-pin plug & the ATX12V plug.) All powered up.

Please help. This computer is a monster and I want it on its feet asap. Either its a faulty mobo, or a PSU. Keep in mind that the computer booted perfectly the first 5 or so times. I have WinXP, all drivers, and a game installed. It just all of a sudden stopped working after I plugged in the external audio wires (the plastic block & wires that connect to the front panel audio plugs) into the mobo.
 

myocardia

Diamond Member
Jun 21, 2003
9,291
30
91
No, that's not enough power for an E6600, plus two 7950's. So, you've already unplugged the front panel audio connector, right?
 

Bobthelost

Diamond Member
Dec 1, 2005
4,360
0
0
It probably is enough. 550W PSUs can handle SLI'd 7900GTXs and they draw more power than a 7950GT. Since it works with the old system i'd say the PSU is fine (don't like the model though, poor choice but now you've got it... :()

You have tried removing the Audigy card haven't you? It's not explicit in your post but if you only get booting problems when that's in then i'd be looking at that for the point of failure.

Short answer: Don't think it's the PSU at fault, ditch the creative labs card for now (nothing but trouble ime) and look hard at the motherboard.
 

mrp

Junior Member
Sep 26, 2006
3
0
0
Do a quick test, pull one of the GPU's and run it single, if it boots with one but not two it is the PSU.
 

hAxsYn

Member
Jan 28, 2005
131
0
0
Ok, so I just rebuilt everything in the morning. It's finally working again. I dont know what happened last night... weird.

Are these results good? 3DMark05 Benchie