My 8500 PowerMac ( with a Sonnet G4 processor ) will not startup. The internal SCSI drive and the internal IDE drive fire up but then nothing shows up on the desktop. The SCSI drive ( 2 GB ) has OS 9.1. The internal 40 GB IDE drive is portioned with OS Tiger installed on about 10 GB and OS 9.1 on the second partition of about 30 GB. The computer was working and then after a shut down would not boot into OS 9 or OS TIGER. The installation of Tiger was made by using XPostFacto. Thoughts/suggestions please.