Freezing on start-up, odd display glitches and streaking: what's going on!?

Hello all,
Recently the condition of my MacPro's performance has steadily declined and I have no idea what is going on. Upon cold start, the macpro freezes up when the desktop hasn't even properly loaded. Frequently, after having a normal start-up, I see odd graphical stretching and shearing of the display, as if someone were stretching a part of the display like rubber.
There will also occasionally be odd horizontal streaks (very thin, about a pixel or two wide) running across the screen.
To add to that, some video has not loaded properly in Safari and has caused frequent application freezes.
Can anyone pinpoint what is going on with my investment? Is it a graphics card issue, an issue with the HD, an issue of corrupt files/viruses, start-up items, or even dust?
It seems to be getting worse and its become really annoying.
I'm not even sure if turning it on is doing it any good anymore.
Any help on this is greatly appreciated!

Thanks, sorry I didn't post the specs but I was in a rush. I pulled the side off the tower tonight and I have the ATI Radeon X1900 XT 512MB card in my Mac Pro. It had been running fine since 2007.
I noticed it had some dust in it so I took everything apart on the tower and cleaned the whole thing. After I put it back together, I do not get the black streaking now. I still get some very small colored specs, but no freezing up of the system either.
If that card is prone to failure or dust issues = bad performance. Is there an option someone can suggest for the older dual core mac pro's?
Thanks,
John M.

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Freezing on start-up, odd display glitches and streaking: what's going on!?

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