cupcake

Hii, this is the only website i can find that looks helpful i just need to know why when i put a video from YouTube on full screen does the picture go blue the same thing happens when i view a video from my documents/that i have saved onto my computer its been like that for about a year now and its really getting annoying. i have searched on this website for someone who has the same problem but i must not be searching properly and i know this isn't were im supposed to post my problem but i don't know how to do that either i would appreciate some help ... Eve x :)