Thanks to all for previous comments. Installed Seagate 80 gb Barracuda drive tonight; installation went fine.
One problem remains: persistent white noise out of speakers, and terrible sound quality. In sound control panel, output panel has "Specialized Audio Laboratories," with message reading "no settings for this device."
Initialized the drive twice tonight, first time building it up to 9.2.2, second time to 9.2.1, figuring a component was missing, same result. Trashed sound preference file, restarted with no change. Start up chime works, but all subsequent sounds are awful.
Solutions appreciated!
Thanks.