Mine died a few months back, but cos I wanted to get a beast asap I decided to just replace it rather than fumble about trying to figure out what was exactly wrong.....but maybe somebody can help your situation and get it going.
I got a new load of bits as a self build cos I have specific requirements, but there is some good prebuilt units out there - it depends what you wanna spend if you want a new one. I robbed the CDRom off my old PC and a few bits and bobs too, but they arent expensive as they were when I got my first one anyway!.
I got stuff from both Scan and Microdirect, who are both Northwest based, and both delivered promtly and there was no hassle.
Try a look at the new microdirect 'systems' whilst you wait for somebody more pro to answer your questions!
eg
http://www.microdirect.co.uk/product...ProductID=6278 http://www.microdirect.co.uk/systems.aspx
Sirius.