Factory resetting HTC Explorer, Stuck on HTC wite screen

I had rooted my HTC explorer/pico (usin superuser) myself, then I change the default location to instal apps to sd card, I tried to install the maps, youtube and playstore apps into sd card, first unisntalling them, then installing again, so they go straight into the sd card, but they don´t work, so I restored factory settings.
The thing is, that it's stuck on the HTC initial wite screen, from an hour up to now. I don´t kwon what to do, please help