All white screen with black lines

Hi there,

My phone was working perfect then I pulled it out of my pocket and the screen is all white and ther are black lines running horizontally.  the lines are fine and in a good resolution and it gives me a slight vibration feedback but it wont do anything at all or change screens it seems completely fried.

i bought the phone from someone on craigslist and i have had it for 4 weeks and it has worked flawlessly up until now...

please help!