I strategically started to walk closer to it and caught a glimpse of a very dusty copper Zalman CPU cooler... knowing that wouldn't be installed on an old dog of a PC I checked the coast was clear (our local dump wont let you remove stuff) I grabbed it and in seconds the computer was gracing the boot of my car!

Once home and on closer inspection I realized it was pretty much complete!
it had...
650W PSU
An Aluminum Cooler Master case - bit dated looking so will probably grace the dump again soon
500Gb Samsung HDD - in a fancy HDD Cooler case
1Gb ATI HD5770 GFX card
6Gb RAM
Core2 6600 2.4Ghz CPU
Copper heat pipe CPU cooler
Sound Blaster X-Fi Sound card
CD/DVD Burner
I thought well this machine must be dead.... nope! I plugged it in and it fired straight up! - well no one is daft enough to dump a HDD with anything on it surely???? oh yes they are! full of music, movies and family pictures!

The mainboard is a pretty dated one, but its an Asus Nforce SLi board with a heap of overclocking features! happy days!
I got a spare HDD and installed SteamOS and it worked a treat! - today I stripped it down and washed all the parts with aqueous foam cleaner and ordered a cheap Zalman HTPC case... I'm going to run it as a Steam Machine... I'll keep you posted on how it gets on.