Thanks, I will check the fuses.
I needed to be a little more specific...my fault. I had only pulled out the factory radio and went inside to get the after market radio....when I went to get in the car the alarm went off and i put the key in the ignition and it stopped the alarm, but then the car would not start up. At that point I had not put in the other radio or ran any wire or changed anything...just pulled out the facotry radio???? that is what is puzzling me!