Ok, went out to start my trailblazer and it will not do anything. Will not crank or start, nothing it's dead, no indications of anything going wrong prior to this. Battery has been tested it is good with no issues. As well as the alternator. I think it was a fluke thing, but we were able to jump start it once, but not it will not start again. When you turn the key the lights etc come one, but no cranking or anything... Please help me! Thanks in advance!