BB Bold :: Temporary White Screen On 9780?

Today, a white screen started appearing on my Blackberry. I've almost never dropped it (maybe twice in my life, with the cover on it), but it have been through rough cold temperature (-15 while snowboarding or skating), if this information can help.
The screen first black out (it's kinda grey-ish with lots of vertical lines, mainly black, some whites and a few colored) then turns white with ONE pink vertical line. Really weird. I try to make it disappear by clicking on the lock buttons multiple times and on the shortcuts key, sometimes on the track pad, and the screen becomes perfectly normal sometimes. Except when I press the shortcuts key, there's a big rectangle (not full screen but almost) where the text is blurred... Sometimes it disappears, or black out again. I tried to restore a previous back up file: didn't work, tried to reboot it by removing the battery: failed.