So it was the power supply, and I didn’t have to resort to spending a ton of money (well, yet anyway). After installing the new power supply, and finding the solution to my next problem (the system running super-slow with 4 1G sticks of RAM) – installing a BIOS update, everything is back to normal now. I’ve got 64bit Windows 7 running well, am busily re-installing all my apps and copying data around, and have installd VMWare and have Ubuntu installed to hopefully check the feasibility of using that as an alternative to a second physical machine on the floor.
Oh, and Merry Christmas to my 3 readers 🙂