I have an iBook G4 1.33 that has been running fine. I changed the optical drive today to a UJ875. All went well with the install but when it came time to boot the laptop it came up as normal and then went to sleep and won't respond to any key inputs or attempts to awaken it. It does not boot fully, just part of the way. Reaches a point where it tells me the clock is set to the wrong time. Thanks, Keith