8800gt - no signal to monitor - worked fine yesterday

Hi guys,

I built a new rig which worked fine for a couple of days, then I put some more fans in my case, put the mobo and everything else back in the case..and now it won't boot properly.

Everything seems to start (case fans/DVD/gpu fans, etc) but I do not get any signal to my monitor (tried 2 different monitors).
I tried clearing the cmos multiple times by shorting the pins, removing the battery, etc
Even tried to remove everything and to make it boot with the mobo outside the case, with only the power supply, 1 memory stick and the graphic card connected to it ... no success...

I'm thinking there might be something wrong with either my motherboard or my vid card ... even though it was working perfectly just before I put the fans !!!

Here's my rig :

Case : Coolermaster CM 690 Mid Tower Black ATX Case
CPU: Intel Core 2 Quad Q6600 Quad Core Processor
Memory : Crucial Ballistix PC2-6400 2GB 2X1GB DDR2-800 CL4-4-4-12 240PIN Dual Channel Memory Kit
Vid Card: Palit GeForce 8800GT Sonic 650MHZ 512MB 1.9GHZ DDR3 PCI-E 2XDVI-I HDCP HDTV Out Video Card
Power supply : Corsair VX550W 550W ATX 12V 41A 24PIN ATX Power Supply Active PFC 120MM Fan
Motherboard : Gigabyte GA-P35-DS3L ATX LGA775 P35 1333FSB 1PCI-E16
HD : Western Digital SE16 500GB SATA2 7200RPM 16MB Cache
Heatsink : Noctua NH-U12P LGA775 AM2 Heatsink Heatpipe Cooler W/ NF-S12P 120MM Fan -12.6-19.8DBA

Any ideas ?

I'll prolly have to get my vid card verified at some computer store tomorrow ... and I don't have another pci-e card to test in my current rig.
Thanks !

Because of my heatsink I had no choice to remove the mobo out of the case to install the top fan which is above the CPU.

I already checked all my connections (I dismounted everything and built it back outside the case) and no luck

I bought all the parts from an online store .. I might have to RMA something but I'm not even sure of what piece is not working.

I'm gonna have another vid card tested in my system today and I'll test my current 8800GT in another PC to find out.

Thanks !

Yeah I've seen many threads on online forums about 8800gt problems when booting up...

As for the ram voltage, I initially changed it too when I was able to boot and get into the BIOS since my ram needs more than 1.8v.

Now I can't even get in there since I don't see anything on screen

Resetting the defaults by clearing the CMOS doesn't help either.

That's what I did yesterday, the guy put another video card in it and it didn't boot, so it doesn't seem to be the graphic card.

Might be the motherboard or psu I guess..

The store should be calling me today to tell me what's defective.