Orijinal gönderinin sahibi: Dan ,
Disconnect the battery and press and hold the power button for a good 1 minute to fully discharge the system. Now reconnect the battery and restart the system '''But!''' You want to hold the '''T''' key so the system enters into Target Disk Mode if it starts. If this works you should see a FireWire & Thunderbolt Icon on the screen. Let us know how it goes.