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Help diagnosing problem

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I built my machine originally in 2004 and upgraded in 2006. I am now having a problem with the following symptoms:

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

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)
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Seems like you have it narrowed down pretty good.
I would suggest trying a different monitor first as that seems to me to be where your problem is. Can you borrow a monitor from a friend for the test?
Take your system to a friends house and try it or the monitor. Either will show if the monitor is at fault.
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