Blank screen and NO BEEP

I just powered on my PC. All fans are working, GPU fan is working. LED on mobo lights up, but I get no BEEP and no video (just a blank screen) I tried using the monitor in each of the DVI ports and neither worked. Although when I switch from one to another and vice versa, the monitor comes on and says no signal found for a few seconds.. then back to an idle yellow on the monitor.

I've read other threads that said bad PSU or not enough power, but I have a 520W PSU and everything else lights up and spins.. so it can't be that.

Any theories?

EVGA 122-CK-NF68-A1 LGA 775 NVIDIA nForce 680i SLI ATX Intel Motherboard
Western Digital Caviar SE16 WD5000AAKB 500GB 7200 RPM IDE Ultra ATA100 Hard Drive
EVGA 768-P2-N831-AR GeForce 8800GTX 768MB 384-bit GDDR3 PCI Express x16 HDCP Ready SLI Video Card
Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Processor Model BX80562Q6600
CORSAIR CMPSU-620HX ATX12V v2.2 and EPS12V 2.91 620W Power Supply
LITE-ON LightScribe Black 20X DVD±R Burner with 12X DVD-RAM write Black IDE Model LH-20A1H-186
Acer AL2216Wbd Black 22" 5ms DVI Widescreen LCD Monitor with HDCP support
Patriot Extreme Performance 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model PDC24G6400ELK
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More about blank screen beep
  1. Problem resolved.. yet another 1D error with what seems to be one of the worst boards on the market (defective-wise), the 680i SLI. Have to put only 1 dimm in slot 3, and others don't work. I actually wonder what the percentage of defective boards is, because after doing some research as to how many people are having the same problem, the numbers are astounding.

    Does anyone know if newegg or evga does a RMA where they send you a new one, and you send the old defective one back after?? I'd even be willing to pay the $220 for the new one as long as it's credited back a few weeks later.
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