Hi, Power Book G4 1GH 17" (Not Intel) I replaced the hard drive with a NEW one. I have checked and checked that all internal connections are good. When I power up, all I get is a folder with a flashing question mark in it. Have tried holding down alt key. I get two boxes, one for try again and one with an arrow pointing right. they both do nothing. Have tried to re-boot with OS X disc but the disc rejects itself. Can anyone help?