Got my old gaming rig for sale...don't get too excited, its last gen!
Specs are as follows:

AMD 5000+ Black edition (running 3.1Ghz) Dual Core
2GB DDR2 880mhz
GeForce 8800gt (Dual DVI output, handy for dual screens etc)
250GB HDD
450W Power supply

Was using an AMD6850 graphics card and it ran most things fine on medium settings.

Would make a good office/backup PC. I have left the Hard drive on a fresh format so that an operating system of your choice can be installed (if you want XP on it to play those old games, I can also install that for you   )
Located in suffolk, but can probably deliver in suffolk, norfolk and cambridgeshire due to work. Could look into posting but it'll cost!

Open to offer really, but as we have to put a price, ill say £80.

pictures below.....

Right, i'll knock £10 off my guess to £70. That's half the price of the equivalent HP units for sale on ebay etc!!