It's running Tiger 10.4.11 and it doesn't have any additional memory installed, just the standard 512mb. I'm really hoping it doesn't happen again, so far everything has been ok, it hasn't crashed or repeat the beeping since that first boot.

I've read that you can fix the bad ram, it is meant to be caused by a broken connection between the board and one of the ram chips.

Hopefully i wont need to find out