Earlier this year I hit overclockers and ordered myself some new parts and ended up buying a whole new system. After many a steam purchase I must now go to Uni and it has to go. Only trouble is given how quick computers depreciate, how much can I reasonably ask for the following specs:
AsRock N68s Mainboard DDR2+DDR3
AMD Athlon Dual Core 5000 (2.4GHZ)
4GB Kingston DDR2 RAM
500 GB SATA Hard Disk
NVIDIA 9800 GT graphics card
Antec 300 Gaming Case
I'm not offering a monitor, but wireless peripherals go with it and a USB 360 pad.
I generally find that a good indicator can be obtained from a auction site, something like eBay. Your local newspaper might have adverts, as might the local shop or store with a public sales notice board.
You are probably best off advertising in a local newspaper than ebay if you ask for me for something like a second hand PC. how much did you pay for it, try it for something you'd expect to pay for a second hand machine of that spec.
It sad but PCs lose so much of their value when you come to wanting to sell one, I too a while back wanted to sell my old PC but in the end I thought I might as well keep it as a second PC in another room than have it go for such a little price.
But you maybe lucky in a newspaper articles for sale ad and get a reasonable amount for it.
Not sure where you are in the UK - I am Nr Cheletenham - might be interested if you can give me a price - stick a reply on here and I will reply - I am sure you want it to go to a good home ! ( I want to start messing with Linus and it could be a good test machine )