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Third generation Surface Pro tablet, released June 20, 2014.

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Dead, opened up the case, now what?

Surface Pro 3 would not start up.

Tried all the usual button press combinations and even putting it in the freezer. I did notice the charger LED would sometimes blink whilst holding down the buttons, but nothing on the screen.

I suspected the battery, so pulled off the screen with the aid of a heatgun. Unfortunately it reads 8 Volts (versus spec on the label of 7.6V). Label also says the battery is 20 months old.

Is there anything else I can try ?

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You have it open I would replace the battery. On some tablet the simple act of disconnecting the battery and reconnecting it is enough to restore the tablet . I have however never heard of this working on a surface but Id give it a try

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I have disconnected the battery, did not make a difference. I will conside replacing the battery, unfortunately it is glued in place.

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Is this yours or a customer's. Sometimes this is caused by the CPU overheating on the surface. Because a client had left theirs on during a windows update in a bag and it overheated and never turned on again just turn on no display, post or input.

If data is needed from it you can use a mSata adapter to plug into a desktop computer and hope that it's not bitlocker encrypted.

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Its mine. I don't get POST and cannot hear the fan spinning up. I had a previous Surface 3 pro go dead but replaced under warranty. This one went to sleep while connected to the charger and never came back. It has bitlocker, but I store all my data on my network anyway. Just trying to get more life out of it. I recently bought my daughter a Surface Pro 4, hopefully it will be more reliable, otherwise we will need to revert to regular laptops.

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I'm guessing you have tried holding volume down and power button to force reset shut off it right?

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Yes I have tried all the different key press combinations. Look like I will need to try and source a second hand motherboard.

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