Could Bad RAM Cause Video Problems in 1st Gen 24" iMac

I have been having video problems with my 1st Gen 24" iMac over the past 6 months, but recently the machine wouldn't turn on at all. I left it at my local Apple Store to be diagnosed and they said that it was just a bad stick of RAM (not a big deal, its cheap these days). But what I forgot to ask them was, could that bad RAM be causing the video problems I've been having or is it the video card also?
Thanks!

Are you still having video problems since the ram was replaced? If the problem went away then it was the cause, it not then something else is.

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