Open the case to see is there any loose wires,also check your memory slots have their memory properly inserted someone might have nocked it a little bit,also check the hard drive is properly connected,its not usualy a big problem, just a loose conection.
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Open the case to see is there any loose wires,also check your memory slots have their memory properly inserted someone might have nocked it a little bit,also check the hard drive is properly connected,its not usualy a big problem, just a loose conection.