If you have a serial console you’d be able to get a lot more information. The 9-pin D-sub connector uses settings 115200 for speed, 8N1 (flow control off/software or CTS/RTS).
Barring that, if you have something valuable you want to save before trying flashing, you could clone. Clone also gives you a chance to test if eMMC read works correctly. You’d be cloning the root partition (a.k.a., “APP”). To clone see:
[url]http://elinux.org/Jetson/Cloning[/url]
Did the unit just start doing this? Was the Jetson ever get updated by flash? Is there any chance the disk is near full? Does network access via ssh work?