I have a G-Drive External Powered USB3 Drive. When I connect the drive to my mac mini via USB3 the mini will not reboot. It will power on and off fine, but won't reboot. I was having problems and did a complete restore from time machine, it didn't work. Then thought about what changed, unplugged the drive, then suddenly the mac would reboot again. Is there a work around for this? Is having thunderbolt drives the only option?