The screen flickers between "full" screen and about 1 inch smaller on top and bottom.
There are horizontal black lines that flicker on and off on the screen that move up and down quickly before disappearing.
I assumed that it was a video card problem, but when I tried a different card, it did the same thing. I am thinking now that it could be the monitor or the power supply, both of whom are from my original 2004 build.
My monitor is a 19" CRT a Mitsubishi Diamond Pro 930SB, which was a really nice monitor in it's day. The power supply is a Ultra 500watt modular unit.
Is there any way to diagnose this problem without trial and error? I don't have a spare PS or monitor.
Here is the rest of my system in case it could be something else
AMD FX55 CPU
EVGA nForce 4 MoBo
EVGA gForce 7800GTX
2 gigs Corsair Value Select (4 x 512)
Hatachi 200gb HDD
WD Raptor 36gb HDD
Mitsubishi Diamond Pro 930sb monitor
Ultra 500wt PS
Cooler Master Stacker Case (5 fans)