Man, I had to build a computer practically from scratch. The computer which was shutting itslef down had a dicky power supply, meaning the fans weren't powering up. I bought a new supply and fitted it, and it worked but then shut down again.

Turns out the motherboard wasn't supplying power to the fan. Plus the back fan, the big one, wasn't even plugged in.No wonder it was the quietest one we had. Luckily we had another machine just like it so I was able to change the fans and hard drive over from one to the other. Now the accounts machine has the full compliment of fans and the spare is running just on the back one.

Got away a little later than the 12 noon I was hoping for, but returned in time for the kids.