I've enabled photo upload for, you just incase it helps.
I don't think I've seen the screen go white before, blue is the universal colour for on-but-no-signal. I can't remember what colour it is when you fire it up though, and I don't have one to check.
Do you have another device to try the screen with? Anything with an HDMI output should do in a pinch.
Also, have you firmly seated the ribbon cable? A picture of it plugged into the driver board would be useful.