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Argh! This is getting frustrating! I appreciate any help you wise folks can bestow on me.

I was recently conscripted to build a 2,000 budget computer. Here's what I got:

Gigabyte EX58 Motherboard
i7 920 1.66Ghz Processor
2x Nvidia GeForce 9800 GTX 512mb Video Cards
6Gb Corsair DDR3 in RAM
1Tb Samsung HDD
Rosewill 850watt PSU
Plus a changed out CPU cooler (Contact freezer), a HDD cooler, and the DvD/BluRay drive's going on.
22" Acer X223w LCD monitor

The issue at hand?

The computer doesn't start up- entirely.
When power is turned to on, everything lights up, fans spin, HDD hums and clicks, the RAM lights come on, VGA fans kick to full speed, and everything looks awesome until you look at the monitor, which sits with a yellow light (idle). Checking the Mouse/Keyboard also shows that they aren't receiving any power and this could be the USBs, I don't have anything else to test them with though.

What's going on? I've done a crap load of stuff to check and see what's wrong, and I'm still stumped! I've...

-Removed/replaced VGA's
-Reset CMOS (both by reset short and battery removal)
-Removed and checked all wire connections and PSU hookups.
-Tested Monitor and VGAs on another computer (all work)
-Checked Ram
-Removed all ram but 1 stick
-Tried using the monitors AVI IN and DVI IN hookups
-Swapped around the VGAs positions, tried with only one at a time, changing the PCI-E slots up.
-Checked for shorts (IE lodged screws and such)

I can't figure out whats up. Obviously something is wrong, I don't think it's my connections, PSU, or CPU. Anyone able to enlighten me?


Note* I did have some funky weather from the PSU, it would start for a few seconds then shut down about twice, and had it just shut down once after a short period of being on (a second or two). However this seems to have stopped and I think was due to a loose PSU cord.


Thanks in advance.

[mctw]

Most likely to be your PSU, have another one you can try?

Also, have you tried using just one card?