2011 Patriot Radio Won't Work

I have a 2011 Jeep Patriot with a RES model radio/CD player. It worked beautifully for years up until about a month ago. Then I could no longer receive any radio signals on AM or FM. It would occasionally kick in for a few seconds, but most of the time the radio audio was dead. The audio when I played a CD still worked fine. I assumed is must be an antenna connection problem. I took the car to a local Chrysler dealer and was told the diagnostic charge to just look at it would be $120, and that's not to repair anything. I balked at this high price and decided to investigate it myself. I search the internet and found Youtube videos on how to open up the console and remove the radio unit and check the antenna and power connections. I cleaned everything out with compressed air and reassembled everything, making sure all connections were tight. Now, the entire raido/CD player won't even power on at all. I thought about buying a duplicate radio/CD unit from a salvage yard or ebay, but if that doesn't work, I probably won't be able to return it, and I'll be out $50 to $100. I really don't want to sink $200+ into a radio. Does anyone have any ideas on what could be wrong and how I can economically fix it?