I'm helping a co-worker set up his new 17" 2.16 with 1 GB RAM. After installing the latest Quicktime and Security update today the machine won't start up properly. It hands on either a blue screen or on the Apple logo grey screen. I hooked it up to my PB and booted it as a FireWire disk and ran DiskTools. There were some problems with the verification that DiskTools repaired but it still won't start up. Any thoughts?