Hi .. While working in PS it is freezing for a moment and wild purples and greens make large pixel patterns behind the program on the desk top. Any ideas ? Thanks.

Hi .. A never before seen problem for me .. While working in PS with large files , the program freezes for a moment and bright pixels of flourescent colors of purple  and green fill parts of the background screen behind Photoshop. Its getting worse ? The programs are running extremely slow also. Thanks for any ideas.

You can't and don't have a PowerMac (G5).
Repairing Permissions, likely just waste of time.
REPAIR the HARD DRIVE instead.
Blowing dust around inside is a really bad idea. Or in the house.
http://support.apple.com/kb/TS1417

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