Put some pics up... someone maybe able to help.
These sort of posts aren't usually tolerated but you've got your site supporter tag otherwise replies woulda been more along the lines of...
What Nick said ^
That being said, expecting an accurate valuation without any idea of what's on it is a bit of a tall order!
Suggest you post a thread in the for sale section (with pictures!) and put a price you're happy with.
If you're aiming too high then people can always have a haggle. If you just want maximum cash back then slap it on eBay and hope that you don't end up getting dicked about