URGENT!!! computer problems..?

Ok, I was on my computer and the screen was turning yellow so i turned it off, now it wont restart wut happend?? plz help me.. its a micosoft windows XP media center edition 2005
Update: if it helps my Ipod ws plugged in at the time I was charging it...
Update 2: I have spam blocker, norton.. so could i really still get a virus?
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