Totally bricked - no ADB, no fastboot, no screen. Recognized as APX device.

Hi all!

First of all I would like to give small heads up - I've been searching XDA and web for two days and ended with no working solution.

Situation:
Suddenly my Nexus 7 (2012) just died. No charging signs, nothing. So i tried Google described and random hardware resets using buttons with no luck.

I ended with situation:

• device is not turning on - no screen flickering, not even small amount of pixel light visible,
• ADB - no devices found,
• fastboot - no diveces found,
• nvflash - only my GeForce PC card found
• when I connect device to PC I have to hold power button for ~10sec and there I hear "boing" (USB dev. disconnected), "boing" (USB device connected) sounds.
• device is visible as APX device with "!" mark

I've tried:

• hardware reset by pressing: power button, power+volume's buttons for different amount of time,
• taking back and disconnecting battery,
• using different software to discover device,
• editing driver .inf file to recognize my device as ADB device. It did but still no visibility via ADB or fastboot (URL: http://ift.tt/1QL9Zmu),
• read and tried to use things from: http://ift.tt/1QLa1uK.

No result at all...
One more - when I unplug and then plug in battery while having back taken I can hear sound that something is "running".

Please help!

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