For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
Plugged an external DVDRW (USB only, non powered) into port 4 of this imac, system immediately went off, on reboot system attempts to boot OSX and fails. Using a boot USB, determined ports 3 and 4 are dead. Ports 1 and 2 closest to power plug function. Successfully booted OSX to safe mode...