OK...So I have a problem!!!

[frizzybangs]

This is my system:

Asus A8N-SLI premium
Opty 165 w/ stock hsf
EVGA 7900GTO
Antec SmartPower 2.0 SP-500 500W
OCZ Platinum 2GB (2 x 1GB) DDR 400 (PC 3200) - OCZ4002048ELDCPE-K
74gb Raptor 8mb cache
WD Caviar SE WD1200JB 120GB 7200 RPM 8MB Cache
Sony DRU810A DVD burner
LIAN LI PC-61 USB

So yesterday I was going to replace my 7900GTO w/ EVGA 8800GT. I uninstalled drivers, ran driver cleaner, turned off computer and turned the PSU switch off and uplugged. Unplugged PCI-E power cable and took the 7900 out and replaced w/ the 8800gt. Plugged everything back in and tried turning on the power and my computer wouldn't even turn on. Fans on PSU didn't even come on. Unplugged hdd, dvd, and case fans and tried again... nothing. Took memory out and tried again....nothing. Green light on board was still comes on. I don't know if this works, but I also took out the Opty and hsf and tried again...nothing. So today I took my PSU to local PC shop and they tested the ATX power cable and said it was OK (this was after I ordered Corsair VX550 last night). My question is: Could my problem still be my PSU or is it more than likely my mobo?

 

[AMD_RULES]

You may have tried this (although you didn't say), have you tried re-seating the graphics card (either one)?
Did any of the power connectors come undone (P4, Main 24pin, etc)?

 

[frizzybangs]

I did try re-seating both cards and checked connections and they were all connected.

 

[jtom617]

ive had this problem before, it ended up being the motherboard

Mine also just died out of no where, i dont go with asus anymore, but this might not be your situation..

i hope it isnt either

 

[Dangman]

Sounds like a mobo problem to me.

See if you can test most of your hardware in someone else's PC. If all of the parts check out, then you have a dead mobo on your hands.

 

[HeavensCloud]

Sounds like a mobo problem to me.

See if you can test most of your hardware in someone else's PC. If all of the parts check out, then you have a dead mobo on your hands.

+1.

 

[frizzybangs]

I wish I could. None of my friends that live in my area have a systems that I could test on. I could probably back to the PC shop. Thanks for the advice.