jack the front end up to get the wheels off the ground , then trytomove the wheels around by hand , also try moving the steering wheel when turning the key, it worked for me when i had the same issue.
My amp stoped working so i had it repaired. I also repaired the surounds on the door woofers. The rear speaker that you say is blown is more mid and high, if you replace be sure to use the same impedence.