My pc cannot stay shut down?

My pc cannot stay shut down?
when i select shut down..it shuts down and restarts by itself..i have to switch off the mains.am worried this may affect my pc sooner or later.HELP

Answer:
UNPLUG IT FROM POWER.
Hello friend...I had this same problem year befor.I Knows this problem.The vires in Bios.I dont know how to repair this.But i have one way..which is reinstallation your computer.That is very best idea.If you reinstallation your computer,that will be fresh...
i had exactly the same thing happen to mine-not only did it turn off after 10 seconds-then restart-then turn off again etc. but it would turn on of its accord whenever it felt like it. and in my case the problem turned out to be to begin with the power supply then the mother board-so expect an expensive fix i am afraid :(.

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