I just bought a Blue & White Power Mac G3/350 (code name Yosemite) loaded with OSX (and nothing else). The HD is 6 gigs and I need a lot more so I'd like to add another INTERNAL HD. I read a manual for a G4 (See note 1) and the operation appears to be pretty simple. I am just wondering if there is anything I need to look out for? I'm thinking as long as I am careful and do things like touch the chassis before I begin and not break anything inside I'll be OK. I think it's just a matter of taking a screw out of the "holder" and sliding the HD in and then connecting the power cable and the SISC (or whatever it's called) cable. Then, once I fire up the MAC, I can format or configure the HD to operate correctly. I'm hoping it will work and solve my space/storage problems. Otherwise, I'll have to go with an EXTERNAL HD and this would clutter up the work area. Note 1: I could only find a manual for a G4 but it looks to be a very similar machine as far as the lay out of the machine.