Well Im probably off...but when I price it out as parts, I come up with around maybe $300 (US dollars) or alittle more if Im being generous.
This IS used....it IS a compaq....most of these parts are fairly obsolete...I would mostly want it for hard drive, monitor, and memory.
The video and cdrw would be used as upgrade for older worse computer.
As a starter system for someone who doesnt do much more than surf and email it would be a great starter system and you might find someone willing to pay $350 to $450 (US dollars)
Sorry hard to gauge...depends on the target market.
Good Luck with whatever you do with it!