My ac doesn't come on goodman 2ton gsh130241ac new batteries at control

My ac doesn't come on goodman gsh130241ac new batteries at thermostat breakers checked unsure ever worked. Just purchased dec'11 seller shady

So many places to start...

Are you intersted in trouble shooting this?

Can you use a voltmeter and are you comfortable working around the unit?

Since you have done the basics already (exept changing the 'magical filter') that would be the next logical step - if you answer yes to the above questions.