Thunderbolt black screen after restart?!

[KMullins]

Yesterday my phone decided to keep turning the ringer volume down by itself so I did a restart and now the display will not come on.  I can hear sounds such as the thunder in the start up and calls coming in, even the back lit home and menu keys light up. 

I did remove the battery, but nothing.  Any help would greatly be appreciated!

[lemew]

Has your phone been exposed to any moisture?

[vzw_customer_support]

Oh my KMullins! A battery pull would have been where I started too, but I'm sure it was disappointing that it didn't end up helping. Since there's definitely power to the device, that's good. One thing that I've come across that will cause the device to malfunction the way you've described is physical or liquid damage.
If there hasn't been anything like that that's happened, try starting with your phone powered down and then pressing & holding the volume down & power key for ~10 seconds. If the screen comes on with the Hboot screen, that's great! That means you can stop here and pull your battery and the phone will boot up normally. If you're still having trouble, follow me (JenniferH_VZW) and send me a direct message so we can talk about your replacement options.

^JenniferH_VZW