I've just done a clean install of Hardy, and everything's working fine with the exception of one issue: I've had my system crash on me three times now. Two of the times were when I was logging out, and the other time I was opening a .wmv file in Totem.

In all three occurrences, my screen suddenly turned black and the computer stopped processing (although it was still on). Ctrl+Alt+Backspace did not work, and neither did the power button, so I had to turn off the power to get it to shut down. On the next boot, the Ubuntu jammed halfway through the initial loading (when it shows the boot splash) and I had to turn off the power again. It only started up properly on the successive reboot.

I'm not sure what the problem is, but it seems graphics related to me (I have an old Intel integrated graphics chipset that hasn't given me any trouble so far). Does anybody know how to resolve this?