I used a seagate external harddrive for my intel iMac which i sold and backed up pics music photos. I just plugged in the seagate into my new Macbook Pro but the external harddrive won't mount and i try to push the front button to turn it off and it won't eve turn off! i have to unplug the cord to force and turn it off!!! what the hell is going on someone please help me!! i've had it plugged in for the last half and hour!