White screen and flashing power light?????

I've had this macbook pro for 8 months now. No problems with it so far. Today i was live streaming some tv shows and the computer froze, however i was able to move the mouse. I manually turned it off and now when i turn it back on i get a white screen and the power light flashes. After waiting a few minutes it still does this. Every time i turn it on and off it does the same thing. I'm not too good with fixing comps, does anyone know what this means, whether its serious and how i can fix it????
Any help will be greatly appreciated!!!! Im in panic mode i really need this computer for my studies.
thanks!

White screen, or gray? If it's gray, and the latch light is flashing, either 1 flash per second or a triple-flash-pause-repeat, that indicates a RAM issue. Try uninstalling and re-installing the RAM (sometimes they become loose). Instructions are here:
http://support.apple.com/kb/HT1270

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