I had the same problem. here is definitely what I did.
You should have a USB Recovery as the on device recovery doesn't work with TP10.
Hold strength + volume down button to boot into menus display screen.After you successfully install DE, encrypt the drive, and restart, users are unable to authenticate at preboot on an HP ElitePad 900 because the touch screen fails to function. So, any application that tried to use the Absolute Pointer Protocol to issue commands would not get translated to the underlying hardware. Because HP ElitePad tablet comes with 64-bit UEFI firmware, you need to check the GPT (required for UEFI boot) option. After your USB driver is burned successfully, plug it into your HP ElitePad tablet.
Select F11 recovery.
Select TroubIeshoot.
Select Advancéd.
Choose control quick (CMD).
As soon as inside order prompt type DISKPART and press enter. right now diskpart will release. make use of it to structure your hard get: type list volume, after that type select volume lt;xgt;, repIace It;xgt; with the OS volume quantity (usually volume 0) and then type clear to remove the quantity. More details on how to perform this át http://www.téchhack.co.uk/2011/03/31/format-a-hard-drive-with-command-prompt/
as soon as you have wiped your hard drive strength off your elitepad. Plug in the recuperation USB and energy on the unit as stage 1.
Select Y11 recuperation, then troubleshoot and then reset your Computer. It will inquire if you wish to maintain the unique partition or ré-partition the commute. I generally choose to repartition the push simply like factory authentic.
Wait around about 3 hours for the recovery and after that unplug the recuperation USB and yóur elitepad should work like fresh again.