[Q] Shows Nothing

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http://forum.xda-developers.com – My Play won't show anything on the screen since yesterday. I think its battery had died but even after I charged it and still I wouldn't even get to the bootup screen when I tried to switch it on. I flashed backed to stock firmware, and still wouldn't show ANYTHING on the screen. I've tried to relock the bootloader so I can still use the warranty, but I'm not sure whether it worked really, because usb debugging was off. I've never had ANY problems with either battery, flex cable or even overclocked too much. So I'm begging for suggestions or at least a confirmation that my bootloader has (HowTos)