Just upgraded my card from 8800GTS 320mb to N9800GT-MD1G. Everything else is fine, I am able to see the pre windows bootup screens as well as successfully boot up to windows, but when I try to to enter Bios setup by pressing Del, my monitor just goes blank. I tried to connect the vga cable to my onboard graphics port but it didn't help, worst still nothing shows up. I can't try with my old graphics card anymore because its faulty. Any advice? Thanks.
I think I had a similar problem. couldn't display native 1680 x 1050 without drivers installed, so every time I upgraded I'd get a black screen after loadup, lame restart, etc. I changed my screen res to like 1280 before rebooting and now I don't have a problem.