Blank screen

Yesterday I assembled a new pc and am having a little difficulty. Everthing appears to be working fine except for the fact I can't get the monitor to work on the new pc.

Here's the basic video hardware:

ASUS A8N-SLI Deluxe motherboard - http://usa.asus.com/prog/spec.asp?m=A8N-SLI Deluxe&langs=09

2 eVga PCIE 6800 GT's in SLI - http://www.evga.com/products/morei [...] P2-N376-AX

21" Sony Trinitron monitor

The monitor works fine on the old pc.

On the new PC I have to use a DVI -> VGA converter since the cards have 2 DVI connectors only. Also, the motherboard has a little chip located between the 2 PCIE 16x slots that you have to flip based on single or dual video cards.

Here is what I've tried:

Using only 1 card
Using only the other card
Using both cards
Using both cards but putting them in the opposite slots

In all of the above I've tried attaching the monitor to all 4 DVI connectors and also moved the chip on the motherboard from single to dual each time.

So, it could be the motherboard, the video cards, or something I did. Unfortunately I don't have anywhere else to test the new video cards at since they're PCIE and the old PC is AGP. They do however "turn on" since you can hear the fan on the video card moving and feel it vibrating slightly.

This will probably turn out to be something simple and be attributed to the fact I don't know what I'm doing, but if anyone has any suggestions here please help me. Thank you.

List your entire system spec, especially power and ram.

have you turned the selector card on the mobo around so that the Dual side is in the slot?

for that system you're gonna want at least a 500W PSU, preferable V2.0 compliant.

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