I have had my current PC for over a year, running Windows 7 with Media Center, and for almost the whole time I have had my OTA antenna hooked up to my PC and have never had issues. Today I decided to clean out the dust inside my computer, so I unplugged everything, including the coaxial cable from the antenna. After I was done, I plugged everything back in, and now I cannot get a signal. The antenna cable is screwed in firmly into the tuner card. Any ideas on what's going on?