Shoutbox

So, im just kinda pissed off right now so if this post doesnt contain everything you need to help me then im sorry. But, nearly every night when i start a song or i start something up or sometimes even not my computer just shuts down. It doesnt totally turn off, because i can still hear my fan running and the orange light in the front is still on. SO i dunno what it is. Also, when i put my computer in standby it doesnt come out when i move my mouse even if i set it to that, so that's stupid too. any help? and just ask for what information you need.

edit: and im pretty sure it isn't over heating. :\