How to diagnose if AGP slot on MOBO is bad

Howdy,

So, I have gone through three video cards in 4 computing days. ATI 9800 pro, Nvidea 6200, and an ATI 7000. Each was run with the latest drivers.

History: video card was apparently crashing system, a problem with the ATI 9800 pro. So I switched to Nvidea card which would not even boot, just columns of characters on black, then today the ati 7000 started with faint vertical lines, and over an hour degenerated into visual insanity. When I restarted machine the display was filled with vertical lines of bright color, but I could still shut down (start key, u, u).

Now I have a PCI ati 9250, which has worked for the last half hour.

I suspect the AGP slot on my MOBO is shot. Is there any way to find out for sure?

 

have you checked to make sure its not the monitor? because that could also cause them problems

 

Two monitors, both appear fine, and the shop had problems with the Nvidea card too. How would you check a crt monitors health?