Putting An Old Desktop PC To Use With Linux (Update)

I was going to put my old Desktop pc to use running Ubuntu Linux on it, but unfortunately after testing it last night and everything worked fine. When I came to install Ubuntu on it this morning I somehow ended up killing the Power Supply after adding a second HDD so I'll not be able to use it unless I can find a cheap compatible Power Supply for Motherboard that's inside somewhere so this little project is on hold for now.

When I ran the Ubuntu Live DVD last night to check everything worked I didn't realise it only had 512 MB of RAM, but until I can do anything with it it's just back living under my desk.

Roland