I was tring to install a new HDD in my G4 DP1Ghz...thought it was just a matter of connecting ribbon and PS lead to the HDD and starting up, but then got flashing disk/folder kind of icon. Powered down, and then was going to remove HDD when my hand slipped and the door opened and the door banged on the floor. Now the G4 starts up but the speaker starts making horrible noises. I can live without the speaker as the audio goes through a firewire audio interface...but any ideas?