OEM Delco Radio

Just purchased a 91 Lumina APV, no radio and the wiring harness was cut. I picked up a delco original radio from the junkyard that had the harness connector attached and spliced all wires together color for color, when I turned it on there is no power, or lights. I checked all fuses, verified that I was getting +12V, ground, etc., any ideas?

COuld this bring some help?
www.avigex.ca/xport/radio.jpg
With +12v and a good ground, can't see what's wrong...

http://www.the12volt.com/installbay/stereodetail/538.html

Seems like cheaper to get a new radio. Not that expensive. I have a killer custom sound system in my lumina van '95, all assembled by me.

Thank You for the replies, I must have initially had some of the wiring wrong at the beginning and blew something in the radio, got a replacement, installed it, and now works great, Thanks again,