Ursprünglicher Beitrag von: originalmachead ,
Either the connector/logic board is damaged at the HD or the HD itself is damaged. If you can run AHT from the USB drive it it may point to problem. '''The "shade tree mechanic's" DIY solution wold be to buy a new HD install it and see if your problem goes away.''' If it doesn't then you're looking at a logic board replacement and you'll have to determine if it's cost effective. ''If this Answer is helpful''' please remember to return and mark it''' Accepted. ''