You need to download the Chrome Recovery Utility app on another working computer with the Chrome browser (this can be a Windows or Mac, doesn't matter as long as it's Chrome). You can find it in the Chrome app store. If you don't have another computer, ask a friend. Then you'll need a SD card and reader, or a thumbdrive. DO NOT USE SANDISK BRAND. They do not work. (I know, because I tried and had to go buy a different brand of thumbdisk. Don't know why, but Sandisk does not work with Chrome Recovery Utility). On the working computer, open up the app in Chrome, and follow the on-screen instructions. You'll need your Chromebook's serial number to set up the recovery disk. Your Chromebook should display it as a part of the error message. One the disk is prepared, you'll need to insert the disk into your Chromebook, and let it do it's thing. I LITERALLY just had this happen to me on Tuesday this week (7.8.16) with my Hisense Chromebook, so I know this works. I've had mine for a year and it's developed a...

On step 3 when replacing the back panel with a new one, they aren't kidding about removing ALL the protective slips. There's THREE of them.

1), the obvious back slip that protects the new back.

2). the one inside the back protecting the side with the camera lens

3). the little square one OVER the lens itself.

First time I tried to reinstall my back, that tiny little square over the lens prohibited my ability to actually get the back on completely. My husband jammed it for me, but the screws still wouldn't take. It's amazing that these things are so precise that the tiny little film on the lens would make it that much tighter.

Anyways, hope that helps somebody. :)