I've had the same problem. To be honest, it did it once and it pissed me off so I 'tapped' the screen with my fingers and it worked again. Not sh*ttin' you. Whenever it goes white, either tap the screen a few times, or move the screen forward/backward. I'm sure this is probably messing up my laptop, but that's what works for me.
I only ship to confirmed US addresses. Sorry to all out of US collectors.
I do require immediate payment when selling.