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try applying the fluid between processor and heat sink

may be coz of processor overheating
try installing a extra fan in the cabinet
and apply some heat stimulating fluid between the processor and heat sink

Mr Rahul
I7 system requires a Graphic card
have you installed it??

the same error occured to my system
i replaced the battery of the mobo,, then my system started working properly,,
try it
hope it will work for you also