Yep Karma you sure can. Ideally Jack if you post up your current config somewhere, ie your gfx card, processor, hd, etc etc, and then ask someone who is up on these things to recommend a new mb you should get one and have change from around ?50.
www.boards.ie has a good PC section, and Data should be able to point you in the right direction.
Have you considered buying a new box with a low end gfx card in it, but with decent ram, nd, and processor and then swop your card and sell your own pc? You'll get the cost of the new one without any difficulty.
Fairy
[EDIT]
Something like this might sort out your problem Jack.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=52475&item=5205909453&rd=1AMD Athlon64 3200 processor
1GB DDR RAM
16x Dual Layer DVDRW
ASRock Motherboard
120GB Hard Drive 7200rpm
Integrated Mirage 2 Graphics
6 X USB 2.0 (2 x front 4 x rear)
Eithernet Lan Port (10/100)
6 Channel Sound
Pretty good system for the price. The graphics is onboard so you could switch this off and stick in your current card. Lots of us here have old cards that you could stick in your current PC leaving you able to sell it.