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Friend of mine has a powerbook G4. The pinwheel/hourglass was spinning nonstop and never ceased, so she shut it down. Now it turns on to a gray screen and goes no further. Any ideas? I know we have a lot of mac users here, and I know nothing about 'em. Thanks
Have you tried putting in the install disc and starting up with it in there holding the c key down? If it lets you get in there try to repair permissions and check the disc. If that doesn't help re install osX and start again.
All sorted it turned out to be a dead HD in the end.