Updated iMac G5 w/ 10.5.4, It Froze, now won't boot

I updated my MacBook just fine. I went home and updated our home iMac G5. The update seemed to work fine. Then the screen froze. I could get menus to drop down, but they wouldn't do anything. The HD icon had disappeared and in its place was a folder icon with a small red minus symbol in it. I tried to reboot, but it only gets as far as the white/grey apple and spinning sun. I tried several hard reboots, then left it on all night. It was still spinning this morning. Any ideas?
BTW I had the Time Machine hooked up so I disconnected it to be sure some doesn't go south with it during this frustration...I should be able to recover if I have to.

If you didn't have enough disk space for the update to run you'd have gotten an error message. What happened? Dunno. For future references: before doing an update run Disk Utility and verify the drive. One possibility is that you had a small disk problem that caused the update to fail. It is also possible that you experienced a small electrical variance during the update causing it to fail or that the Bill Gates fairies cast a crasho freezem spell.
I'm a little surprised that Disk Utilities showed there was nothing wrong with the drive but that the User folder wouldn't open. That suggests that the drive (and that folder) was perfectly okay but that there were permission issues. No, scratch that, you'd have gotten a message saying you had insufficient privileges. This is odd.
You seem to have covered the bases. Good luck.

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Quote from: erikFC on 05-November-07, 23:41:04
I updated the P965 Platinum BIOS to 1.7 and my system stopped booting. After much experimentation I discovered it would boot if I unplugged the monitor and mouse, so I was able to "upgrade" to 1.6, and it's working again. However, the first time it booted blind with 1.7 it got all the way to Windows before I realized what happened.
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Hi,
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Updated iMac G5 w/ 10.5.4, It Froze, now won't boot

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