System locked up, now won't reboot.

I had been using my system for most of the morning, went to make sandwich, came back and system was all locked up. Wouldn't respond at all. Display was on, but dark except for cursor, which wouldn't move. Nothing would make it active again. So I shut it down using power button on back. Waited a bit, then restarted it. Now it starts to boot, goes through the Apple logo screen, gets to clear blue screen and just stops. Goes no further.
Any suggestions? Using my backup system (older iMac) to post this.
iMac 17-inch Intel CoreDuo Mac OS X (10.4.7) 2GB RAM / External Hard Drives (now detached)
iMac

Was the 3 beeps/flashing LED like what is described in the 3rd paragraph of this Knowledge Base article. If so, you may have RAM that is not seated well or defective.
Intel-based Mac Power On Self Test RAM error codes
You can test the RAM with the hardware Test on Install DVD 1 by pressing 'D' while booting from the DVD.
Check the RAM is seated correctly with these instructions;
iMac (Early 2006), iMac (Mid 2006): Installing and replacing memory (RAM)

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