I've seen that in the most of cases is a wireless card problem. Please when you start the PC look at the blue led of the wireless network : if it is alwais on (until the pc turns off by itself) remove the wireless card located under the central cover ( 4x4cm with a cross screw). Remove and isolate the 2 antenna cable from the card. Everything will be allright ! Have fun.
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Something is keeping it from shutting down. This could be caused by a faulty application or driver. My suggestion is to hold the power button down until the unit completely shuts down. Take out the battery, unplug the ac-adapter, attempt to power it on and then put the battery back in. Attempt to restart the computer.
ram, processor, battery bad, its a long list but try changing the ram first, also make sure the processor fan has enough heatsinc goop. and the fan is pluged in, re seat the processor if this dont fix it better take it to a shop. well one last thing check that the cd rom is inserted tight.