I tried to factory reset my Nexus 7 this morning and it took 4+ hours, it stayed on the "erasing" screen so I got bored and turned it off, I figured no factory reset takes that long. Now when I try to turn it on all I see the Google screen with the lock underneath. I can't even get it to load the bootloader (power + volume down). Nothing seems to be working. I tried to connect it to my PC with ADB + fastboot but its not recognized, my computer doesn't even detect it.