On Mar 15, 3:06 am, "The Browns" <garyjbr...@charter.net> wrote:
> Hi,
>
> My PC had been refusing to shut off. Now it won't power up.
> Can someone suggest a possible cause? Motherboard? Power
> supply?
>
> The past four times I tried to shut down my PC it wouldn't turn
> off. Holding the power button produced a click, a drop in power
> (noise) for about half a second then it would start to power up
> again. Pulling the plug or turning off the UPS was the only way
> to shut it off.
>
> This morning it refused to power up. It gets so far then appears to
> be doing a reset. It doesn't get far enough to get into the BIOS.
>
> I unplugged the Disk and CD/DVD drives to reduce load (and
> protect them), then reseated power and power control connectors.
> Those had no effect.
>
> The PC is homebuilt with an ASUS A7N8X Deluxe MB, about
> 3 1/2 years old, the PS is an Antec SmartPower 350, maybe a year
> old. The box is generic.
>
> Any help appreciated.
>
> Thanks,
> Gary

One possibility is that the reset button is stuck in the ON
(closed) position. Disconnect the switch from the front panel
connectors header on the motherboard and try to power up
again.

(When I do this kind of thing while trying to isolate a
defect, I usually disconnect the hard disk first).