Okay, last night I was on the computer, and accidentally clicked Windows Media Player when I wanted to click Internet Explorer. Well, after I clicked it, my monitor went black for 2 seconds, then turned on again sideways! This is freaking gay, I tried factory reset, and it still didn't work. Also, with my mouse, when I technically move it up, it moves my mouse sideways, which is actually up, but is sideways. You probably didn't understand the last senteence, but oh well. I'm pissed.
THere is a setting that changes it, can't remember where. But try unplugging your monitor, and re-plugging it in.
LOL!!! that happend to me today i was freaked ctrl+alt+ any arrow key, the up down left and right ones...try all them one of em willf fix it