My iMac computer screen is blurred by black and white lines.

My iMac G5 screen is blurred by black and white horizontal lines and tiny rectangles. This occured after I woke it up from sleeping. Everything else seems to be working fine, but is impossible to see what I'm doing. Any ideas on how to fix this?

Fixed it! Rebooting the computer while holding down the command, option, P and R keys while letting the chime ring 4 or 5 times did the trick.

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