Help me plz (C510 display problem)

Hello guyz.
when i connected my c510 to the computer using the data cable the display splitted in two window,showing same thing.But after some time it worked when i unplugged the phone.But when i have connected again it get blanked and there is no display(there is just the back light)

Is it a software problem? And should i flash the phone? or its a hardware problem?
plz reply soon.

might be harware problem, best is to visit your nearest service centre