Ignition problems my 04 alero has power when you turn the key on but it wont turn over... any ideas?

Check all your fuses..The one for your ignition, which is designated for your starter maybe blown.. But if your fuses or good, you can check an see if you have power to the starter...( test light ) or Probe light.. An when the key is turned and the light lights up, an the car does not start, then you need a starter..