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ok, only battery, speakers and fans plugged in, i get chime but no reaction to the reset key combination. tried both usb ports and the keyboard works on other systems.

Hi dukefawks, I was unable to do pram reset with external either.I am not convinced that it even detects the keyboard as no lights are present on the external keyboard

not consistent i'm afraid. the questionmark folder takes forever to appear (5min +) it is heating up - the unit. Put new thermarpaste but still, very hot within 3 minutes

I did, same issue :(

at least the power button works on the keyboard. Behaves the same with an external keyboard, although it doesnt seem to be detecting it as the capslock lights and num lock do not light up, also tried disconnecting the normal keyboard and only external but no difference

unfortunatelly not. I thought it was the display but now I get consistent Questionmark Folder Also it doesnt seem to react to any pram or smc reset. Just stays as it is - black screen for about 5 min and then flashing folder

Hi I have a macbook that will always chime and very rarely show questionmark folder icon but mostly just black screen with backlight I have tried the disk in another unit and it is healthy and boots with no issues According to the client there was no physical nor liquid damage and looking at...