One Mac freezes with swirling rainbow, the other screen goes nuts

Older vintage iMacs, but updated with Snow Leopard.  one often freezes up and depicts the swirling rainbow for an eternity...even if only one application is running. The screen on the other Mac goes bonkers after about 10 minutes and any mouse jesture sends random colors across the screen to the point where nothing is visible to click on.
Is there some sort of diagnostic program that OSX has that can fix this? I don't want to have to reload OSX or have to lug the computers into the store.

On your sceen you could have a failing graphics card or display. You can run Apple Hardware Test in Extended Mode, you may need to run it several times. It's a lengthy test so please be patient. Also here is a recent article on troubleshooting displays.
LCD displays common problems

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