I've been trying for the past day, i can't seem to make it restore. I don't have the original AT&T Sim in or have it at all anymore, i have my old cingular one because i bypassed the activation before... I don't know if thats what causing the problem.

Whenever i try to restore it says like an error, Iphone cannot restore... so what can i do to fix it? I uninstalled itunes and reinstalled the newest version and i resetted my iphone countless times.. restarted my computer and put the plug into another usb port and used the dock and then just straight put the usb into the iphone instead of teh dock.. please help