Pc powers on by itself

my computer comes on its own anytime i plug it in and only shuts down when i unplug it...it also has no display..
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It sounds like you have either a bad power supply, motherboard, or CPU.
MikeIT ManagerCommented:
bad motherboard or bad power supply.
Make sure the cords that plug into the PWR and RESET pins on your motherboard are connected properly.

What do you mean, no display?
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How do you know your computer is on if there is no display, do you still have to press the power button?
Net-techTrisAuthor Commented:
when i plug in the power cord for the pc it comes on automatically and the monitor is blank ..but the cpu fan spins an so does d system fan and the power supply fan.. and the only way i can turn it off is by unplugging the power cord
use the minimum setup as described in this guide  :
 http://www.experts-exchange.com/Hardware/Components/Motherboards/A_1945.html                  (Short-overview-of-how-to-troubleshoot-bad-hardware-when-a-pc-does-not-post)

in case the disk has problems, use this article :
I think it's the power supply - try swapping in another.  If nothing changes, it's probably the motherboard.  Bad cpus are very low probability.  What happened to the machine to cause this?  If it was a power outage or surge, everything in the system is suspect, as a blown power supply can ruin anything connected to it.
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