Help required Asus A7N8X deluxe power oddity

Archived from groups: alt.comp.periphs.mainboard.asus (More info?)

In article <1yekc.14276835$Id.2370675@news.easynews.com>, "Sie"
<siejones@freeuk.com> wrote:

> Recently and for no apparent reason when shutting down from windows XP the
> PC would shutdown and you would hear the drives power down e.t.c and the
> power light would go out but the hard drive light would stay on permenantly
> and the cpu/AGP card and chassis fans would stay on. Only by switching the
> hard switch on the back could I get the whole PC to completely power off.
>
> A strange problem but although a concern was not seroius as I could power
> the PC back on as normal by pressing the power button on the front and all
> would boot up and operate as normal until I once again wanted to power off
> the PC and the same thing happened again.
>
> I scoured the internet looking for similar problems and found only one
> thread that matched my problem with the conclusion being to accept the PC
> was working ok and not to worry about it. Being a bit of a prefectionist
> when it comes to my PC I was not happy but accepted this.
>
> Until now that is when I went to power up the PC this morning. I switched on
> the hard switch at the back as normal and the HD light and fans came on as
> normal but when I puched the power swith I got nothing.
>
> Basically to cut a long story short. I have disconnected everything and
> taken off all memory e.t.c to leave just the cpu,motherboard and PSU
> connected and still cpu fan powers up just by putting the power cable in the
> back and switching the Hard power switch on the PSU. I have even taken the
> MB off it's mountings and held it away from the case and exactly the same
> thing happens.
>
> I have swapped the PSU with another that I know works. I have swapped the
> CPU with another I know works and exactly the same thing.
>
> The only conclusion I can come to is that there is some kind of short or
> fault on the motherboard. Before I give in and have to replace it. Does
> anyone have any suggestions?
>
> Thanks in advance
>
> Sie

Maybe the motherboard has a short between +5VSB and +5V ? If you have
an ohmmeter, you could disconnect the ATX 20 pin connector and check for
a short between pins. Generally, returning the motherboard is the
only option, unless the short is an obvious solder blob somewhere.

HTH,
Paul