Currently Being ModeratedJul 4, 2013 4:12 PM (in response to Baby Boomer (USofA))
After having no luck, I later tried removing and reinstalling HD, but that was no help. I then re-installed an old failed HD and was able to log in using Installation disk (but not prompt hardware test by holding D key at startup). Disk utility showed no HD (which may be expected as it was a failed drive). I then restarted again with no problem.
I powered down and returned the current HD and was able to start holding down C to boot from disk. Once I was in, Disk Utility showed my HD correctly and I performed a Verify on the disk and ‘Macintosh HD’ as well as repaired permissions on both and the result for all was a pass.
I then used the Startup tool to select the HD as the startup disk and this appeared to be successful. At the login screen I re-started again, this time in Safe Mode, which was also successful. I then saved some media files that are excluded from Time Machine backup and did a Time Machine backup to two separate disks. When I tried to check the time machine history of one of the disks (‘enter time machine’) the machine froze again. I selected restart from the options after pressing the power button, then restarted in Safe mode. Then I created a bootable clone on an external hard drive – just to be sure!
After updating software I then re-booted and ran Apple Hardware Test (extended) off the Installation disk, which ran for 2 hours and found no problems.
I am going to run a test on the RAM (even though I'm pretty sure the hardware test does that) - any other thoughts still very welcome!
I think the next step is to erase the disk and reinstall the operating system. I'm assuming something got corrupted there ...
Will also go through these steps - https://discussions.apple.com/docs/DOC-3353