OK, about the Phenom failure to run....
First, what PCB version is your motherboard? It'll be silkscreened on the mb somewhere. The Phenom cpu you bought requires that motherboard be PCB version 1.02G. If yours is an earlier PCB version, it may not work, depending upon which 955 you bought (there are two and depending upon which you bought will determine the PCB requirement and BIOS version requirement, touched on below.)
Second, what BIOS version does your mb have? You can catch it on boot or by running CPU-Z in Windows....it'll tell you.
The two Phenom II x4 955 cpus listed on Asus' site as being compatible and their requirements are:
Phenom IIX4 955 (HDZ955FBK4DGI),3.2GHz,125W,rev.C2----needs PCB 1.02G and BIOS 0304 at a minimum
Phenom IIX4 955 (HDZ955FBK4DGM),3.2GHz,125W,rev.C3----has no PCB restriction and needs BIOS 0904 at a minimum
I'm betting you've got one of those two problems...either PCB version incompatibility, and you can't do anything about that, or BIOS version problem, which can be corrected with a BIOS flash to the latest version.
I wouldn't sell the thing until I'd eliminated those two.