ok to start - if its not plugged in i get nothing it wont turn on or anything, when connected i get apple logo, but it flashes on and off, when i do the power and home button reset it comes up with logo then comes up with logo and usb pic- nothing happens, tried using redsnow recover fix but says no data fetched, thought id restore factory settings but it keeps disconnecting from itunes or itunes will say it cant restore, giving error 21 or error 1604, firewall is diasbled, dont know what to do, help!!