Possibly bricked phone

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So I tried to safestrap cm10.1 onto my Droid 4. But, I was much more familiar with a previous version, not with the touch interface and stuff. I did what I thought I had to do: Create a partition, install the zip to it, reboot.

But, to my horror, when I rebooted, I was greeted with a black screen (backlit). I couldn't turn off the phone by holding down the power button either. I had this problem once with my Droid 3, and I 'solved' it by just taking the battery out. But I know things are much more 'locked-down' back there with the Droid 4, so I didn't want to do that.

After a little while, the thing just ran out of batteries. I was hoping to charge it up again. When I plugged it into a wall, I got the little battery icon, which I thought was definitely good news. But now I can't even turn it on, or get my computer to charge it!

UPDATE: I'm going to try using fastboot

Have you tried booting into fastboot and then flashing the stock firmware to the phone?

Also to reboot the phone when it freezes, you can hold the power button and volume down together for about 10 seconds.