Default [Q] Frozen hard reset after install ROM depshining 8.1

Suddenly yesterday I install Depshining 8.1 on my HTC HD7 after installation ROM I try to Soft Reset for some reason. finally I decide to change with new ROM, when try to go BootLoader (Power+VolomeDown) instead show me Hard Reset then try to hard reset but screen and all button frozen!!!
Why can't show me bootloader screen?
why freeze on Hard Reset screen?

Please Help Me.