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Most likely the control module assembly is the problem. It can be located under the dash and sometimes behind the passenger kick panel cover. You will normally hear a click noise when you engage the 4x4 and this click noise will indicate the location of the controller. You may not be able to access 4x4 hi if the lights are flashing but 4x4lo usually works.
Common problem on the 03-06 Trailblazer instrument clusters for the fuel gauge to go out. It's usually caused by one of two main problems, either the stepper motor on the cluster's circuit board is going out or the sending unit on the fuel pump is going out. Check out this blog post about the problem - Trailblazer fuel gauge problems
I have a 06 Z71 and it did the same thing so more than likely your just going to have to buy a new cd player. I would recommend going with an aftermarket cd player because you probably going to spend just as much on another stock unit.
if you have installed a new cd player in there then the propblem could be that your speaker wires and either touching each other or grounding them selfs out.. pull of the cd player and check to make sure all the speaker wires are covered properly and no bare wires are exposed.. if you still have a factory cd player in it then you will probably need to take it to a dealership to have it checked out..