A couple of days ago, my iMac turned off. By itself. I didn't think much of it at the time. I thought maybe I'd shut it down and forgotten about it.
But it happened a couple more times last night and this morning. Now it dies within a minute or two of starting.
Definitely won't get stuff done this weekend that I was planning. Oh well :-)
UPDATE (2005-11-13): Now it dies within seconds of starting. I'd say the power supply is fried. From a little research it seems to be a known issue. Hopefully the local service place has power supplies in stock and can fix it on the spot.
There may be broken links to media on this page. I'm still in the process of migrating them over.