My work computer just did the following: acting real slow. So I shut down the computer. Attempted to turn power back on. Power came on but nothing else happened. Now no power at all is coming on. We do leave the computer on for long periods of time. & it is 2 years old. Is my power source dead? Or bigger problems? None of the other computers on the network have any problems. So I dont think its a virus. Help ASAP!! Call my cell preferred!