I have a mirrored door G4, dual 867, with the master disk drive being the factory installed Philips CDD5101. System Profiler shows that the drive exists, it still ejects/retracts the CD tray when promted, but it doesn't want to recognize any disk I instert (regardless of type of disk, from system to audio to disk previously burned using the same drive). Any trouble-shooting tips would be appreciated. Sys Profiler specs are as follows:

PHILIPS CDD5101:

Model: PHILIPS CDD5101
Revision: A3.5
Serial Number: H92380639LXVA
Detachable Drive: No
Protocol: ATAPI
Unit Number: 0
Socket Type: Internal