If you locked the hard drive then you will need to unlock it 1st (if your other xbox isn't booting at all then hopefully you backed up your HD key or eeprom).
If its unlock then you can just put it in the new xbox (just makes sure you are using the same partition setup for theBios, meaning if before you had all the space on F: or if it was devided into F: and G: then the new Bios you use on the new xbox has to be same, of course it can be either Evox or Xecuter aslong as the hard drive partition is the same)
