This is the weirdest problem I've EVER encountered with computer hardware. When the graphics card is screwed into the chassis (after plugging it in of course). There seems to be some shorting issue which makes the card DOES NOT DISPLAY, it is as if it is dead. When I unscrew they work. I'm using a CM 690 II which I tihnk is made of steel. That is careless imo. Anyone else encountered this? And no, the screws didn't force any disconnection/misalignment from of of the pci express slot
Only thing I can think of is, is the motherboard expansion slots and case expansion slot brackets are somewhat misaligned and when you screw the card in nice n tight it somehow stretches the pins that carry the display info so that the pins on your DVI arent touching the pins inside the card display sockket? The card is definitely running, fan is spinning etc.?
I would try it with a thin maybe a fiber washer under the plate that the screw goes through on the GPU. That should aline it correctly.