New Radio, No Power

My girlfriends 2000 civic dx stock radio was a pos. It wouldn't play any burned cds and the radio was shit. So i went n bought her a new headunit. I put it in and no power to turn it on. I tested it with a power light thing that when there is power the light turns on. I put the stock back in and it wouldn't work either. What coudl be the problem here. The manual said there is no anti theft system in it. Any Suggestions please help me, I'm not getting laid b/c she is pissed at her car HELP!!!

I would say check your fuses. Good luck man!