heyy there ...my pc restarts itself and blue screen appears.

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my PC restarts itself and blue screen appears. i have installed a new copy of window7 hoping that it will solve the problem but the problem remains the same. sometime the PC doesn't start at all , no display but one light on the CPU are glowing permanently(as usual) and the other does not glow at all.... ......hope there is no hardware problem..... mylotian's help plzzz...