99 blazer 200+ thousand miles. once every few months blazer will not start, I mean turn key all dash lights will light as usual but as the key is turned to start lights go out and nothing. no click nothing .installed new battery car ran fine for a month or so ,went out to start and nothing.tried to jump it but it did not help. no under hood light or anything, it would not as much as click..went out hours later and it started right up ran for a few month and then the same thing. any ideas

 

Ignition switch issues? There's a good thread on it here somewhere