PT wrote:

> I usually put my WinXP Home desktop into stanby when I won't be using it for
> a few hours. i do so using Start | Turn off Computer | Standby
>
> The computer goes to sleep. But occasionally it will spontaneously wake up
> after a few minutes.
>
> Any explanation?
>
> Note that I have Power Options set as follows:
>
> Turn off Monitor 10 minutes
> Turn off Hard Drive 15 minutes
> System Standby 15 minutes
>
> Hibernate is not enabled
>

But there are also a number of other factors that may take a computer
out of standby. What is the setting for WLan, or Wake-up LAN? Or for
a Wake-up Modem? Even a very sensitive mouse may respond to vibration
or slight jarring. Windows or Office Indexing will re-activate a hard
drive. Perhaps it could be better if the hard drive was left spinning.
Check the settings and play around with them.