Computer keeps shuting down

Ok so the last few days my computer will just shut down. I recently added a seconded montior. I will be playing a game or somthing and it will just shut off. I resatrt it insantly, all my desktop icons are moved around.

I'm think that maybe over heating but the fan is runing.
 
Tell us more: Computer brand and model or motherboard if known, video connection or video card, Memory installed, operating system, and perhaps most importantly, what is the power supply brand and rating... etc.
Did this problem start only after you added a second monitor? Does it no longer happen when the second monitor is disconnected?
 
re

Computer brand: gateway
motherboard:
video connection: DVI-I
video card: radon spahphire hd 4800
Memory installed:6gb
operating system: widows 7
power supply brand and rating:fsp group inc.300w
Did this problem start only after you added a second monitor? Yes
Does it no longer happen when the second monitor is disconnected? not sure i have disconected it and it didn't do it but it may i only had in disconected for like a day.

Also i notice it almost always happens when I am playing swtor. But at the same time it never happened when I was playing swtor before i added the new montior.
 
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