Imac monitor is pixelating and getting fuzzy...

Hi fellow mac-heads,
My Mother's intel imac 7,1dual intel core, is about 4 years old.  The monitor just started pixelating, getting fuzzy and displaying black stripes both vertically and horizontally.  My first thought, from experience, (my g5 has went through 3 video cards!) was that she needs a card, becaus eit seems to do it when it heats up a bit and dragginthe mouse across the screen reverses the effect temporarily.  Now, i popped this thing open myself 2 years a go and replaced the hard drive and I don't remember if it has a video card.   "about this mac" states that it has an ATI Radeon hd 2600 video card, but a lot of dicession boards say that the video card is intergrated into the motherboard.  Can anyone tell me, before i hae to crack it open or lug it into the genius bar?
thnx in advance.
-palmer

Your system cannot find the startup volume. Please carefully read Flashing question mark appears when you start your Mac , Apple provides the trouble shooting steps in the article. As a general rule of thumb NEVER EVER shut down the system by unplugging it, you have the ability to Force Quit applications. You can find Force Quit under the Apple symbol in the upper left corner of  your screen. Also use Activity Monitor and check to see if you have any run away processes and how much FREE RAM  your system has.

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