So, it's my birthday pretty shortly, as a part of my birthday present my mother got me some RAM and some thermal paste. They both came today.

Pulled the old mobo out, put the new one in, fitted the CPU and followed the instructions to wire everything back up. Found a couple of wires that had nowhere to go but the main wires were in. Plugged it in, pressed the on button.
Nothing.
Moved a few wires about, tried again.
Nothing.
Gave up and called Nagy who has a lot more experience with this than me, he came around and had a look, firstly the DVD is now out of commission because it's too old for the mobo, so I'll need to pick up a SATA DVD drive sometime soon, then he discovered that the plug from the on/off switch at the front isn't the right type for the mobo, and that the PSU wasn't giving enough power to start the mobo up.
So, he's taken it back to his and will hopefully be able to rig up a PSU from one he has already and then get the On/Off switch plug sorted.
The trials and tribulations of putting modern components in an old tower system.

Still...just have to be patient for now.