Whether I am working with a particular program or am just looking at an open finder window: Every few minutes, the entire section of icons on desktop blink out and come back on with annoying results. If I'm in a finder window at the time, it just automatically closes. If I'm in a window of any program whatsoever, the finder shows up as the active program and I have to click on my open window of whatever program I was in to make it active again so I can continue working. This is on a dual 2gig G5 with OS 10.4.11 I've already repaired preferences & done a virus scan. Anyone else had this one and solved it? Suggestions? Thanks.