I was having problems with a "service air bag" light and pulled my positive battery cable to see if it would reset (I know it sounds dumb but I had to try it). I had it disconnected for about ten seconds then connected it back up. I then started the car to see if it worked but it did not and now the radio will not turn on at all and there is nothing even displayed. I checked the fuse and it was good but now I am not sure what to do next, any advise????