This week has been quite busy. most days i've been from 7am -10 pm working on a movie for school. it better be a 100%, but at least it gets to be a portfolio. to add to the frustration, league's bugging on me. any time i try to alt-tab or whatever, it makes my screen blank. totally. crtl-shift-ecs doesn't help, nor do the big-guns crtl-alt-del. only thing i can do is reboot. i'm re-installing league, but are there any other ideas?

no, it's not the computer. it's brand-new, and i know that it eats league like a joke. 60fps max settings on a 1080p display only takes 30% of my graphics and cpu, and my 16 gigs of ram laughs at everything. any help please?