Ran SU on a friend's computer. None of the three updates was huge. Once it got to the Cleaning Up stage on the install it seemed to stall, eventually the spinning beach ball appeared. After an hour of the beachball my friend held the power button to do a restart. It did a double restart (second one about 5 seconds after the first) and now seems to be taking forever on a restart. The normal rotating icon is rotating (not the beachball) but it has now been overnight and it is still at the Apple logo and the rotating thingy.
I was hoping you wouldn't suggest that... That was one of the solutions i wanted to try yesterday, but my friend can't find their disk. I can use mine but I was visiting them for the day and am now home, and they are two hours away.... They may just have to wait for a week till I can get back there again. Thanks.