By "now I unplugged for 10 min and still won't come back", I hope you don't mean it will not power up... (Be sure your power cord is good and the circuit is still LIVE)
Instead of unplugging your UTV you might try a UTV "Reset" Code like 12357... easier then unplugging the UTV. IF you must unplug it... I prefer disconnecting it from the wall and Not directly at the UTV power connector itself... Never like the "arcing" noises it makes...
I'd suggest before attempting a Hard Drive Replacement that you "Restore" the UTV to it's "out of the box" like condition.
Using UTV Code 23552355 will basicly default your UTV back to a "like new" conditon. (THIS WILL DELETE ALL YOUR RECORDINGS AND UPCOMING RECORDING SETTINGS so be sure to dump what you want to save before doing the code)
You will be left with a UTV (with it's OS intact) that should hopefully work like new. If it doesn't you may have to look at problems with the UTV itself or possibly with parts of your SAT Setup. Cable Runs, Connectors, Multi-Switchs, LNBS, etc...
Keep us posted.