Turns off after about 30 seconds

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Okay i know this may not be in the right category but really that doesnt matter to me.
Alright so my Compaq F557US is having problems, every time you press the power button it is starts to turn on the fan and it makes noise but then it just sits there and it turns off after about 30 seconds and it repeats the process
PLEASE HELP!
-No startup screen
-possibly control board mother board or power source (the least likely of the three) and nothing i try seems to work.
 
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