Originally Posted by nugalonious
Now I've tried it all. Definitely bricked.
Took back cover off for easier troubleshooting and now have rebooted it hundreds of times with all four of the buttons pressed in different combinations. No idea what the forth button (Key 4 its labeled) even does because there's no button on the outside to access it but I've tried it anyway
It's not bricked if you see an image
You need to be able to get into the bootloader by using the hardware keys, I read this post thinking they would be in the OP
When the Nexus 7 was announced at I/O JBQ told everyone how to get into bootloader using the hardware keys rather than adb commands. adb commands are fine if the device boots but if you have a semi brick you need to know these keys [and the OP updated accordingly]