What's happening on my screen? (dashes)

Hi there,
It's been a month since I´ve started my iMac PPC g5 and I got all these dashes around. They do appear all over dynamic elements (except videos) and next to the cursor.
Is there a feasible solution to this issue?
Many thanks in advance,
demarcos

It's hard to tell; I would agree with custom mini, since the G5 is an older model Mac, but they shouldn't appear on a screen shot, as in your original comment. Although, it seems to me that it's a low-quality, compressed screenshot, and the lines shouldn't be in the screenshot, in which case the screen is shot, (no pun intended), and you should get a new graphics card. That failing, it'll be cheaper to get a new Mac than to replace the entire screen, unless you're into DIY.

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