My screen just flipped upside down.
On my computer, i was changing my picture when it happend, and also when my parents droped a huge book in front of me telling me to study >-<
On what, you computer? Your phone?
Can you please be more specific?
Also, what exactly were you doing when it happened?
Go to the settings of your GPU. There you have all the settings for your screen.
Hmm... did it flip *everything* upside down, or just one of your photo's?
Control+Up Arrow Key.
At the same time.
search.. ive answered this before.