Pages deactivate after 90 seconds

D

docslip

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For the past 3-4 days what ever program I am using has the same problem. After 90 seconds or so, all the icons on the desktop disappear, then reappear. At the same time I find I am in the Finder and have to select the page I was working on. This occurs when I am online or disconnected from the web, and applies to all programs. I am operating a 17" G4 iMac with OS 10.4.11 and Firefox. I have rebooted cpu and modem, run usual diagnostics including TechTool and disconnected printer, scanner and tablet with no change. My guess is that my power supply is "flickering" though I get no error messages or other clues. I use a UPS/surge protector. Could this be a sortware glitch? or should I give up, get someone to pull the hard drive and buy a new imac? This deactivation has occurred at least 6 times while I composed this message. Any ideas appreciated.
 
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