Thanks for everyone's replies.
I have been really short of time recently, so I have only recently had the chance to have another go. Everything appears to be working well now, despite the fact that the heatsink doesn't seem to clip how I thought it was meant to, i.e. securely
Plugging some headphones in revealed that its says something like 'VGA error' which I took as a good sign (there is no gfx card installed, so I guess it passed all other tests up to this point).
The guy is meant to be ordering a gfc card when he gets paid tomorrow. Anyone got any recommendations?
P.S. Now I want to build myself a PC, now I've seen how relatively easy it is...if only I had the money :-(
