Bob, thanks for trying to help. I've just tried all that and no dice.
Any other suggestions?

On Mar 27, 11:07 am, "Bob" <b...@nowhere.net> wrote:[color=blue]
> Go to Advance Power Settings.
>
> Set hard drive to turn off a minute or 2 before sleep.
>
> Set Hybrid and Hibernate modes to "Never/Off"
>
> Under USB settings select "Disable"
>
> Under Multimedia select "Allow ....."
>
> -------
> *Report back, please*
> [When responding to posts, please include the post(s) you are replying to so
> that others may learn and benefit from the issue]
>
> [How to ask a question]http://support.microsoft.com/kb/555375
>
> "Max" <m...@virtualmax.com> wrote in message
>
> news:fa328835-099c-417e-b2ce-5576f7cda7b8@u69g2000hse.googlegroups.com...
>[color=green]
> > Mine is the Intel P35 chipset, though my wife's computer is using an
> > nVidia chipset and is having the same symptoms, so probably that's not
> > the issue.[/color]
>[color=green]
> > =Max=[/color]
>[color=green]
> > On Mar 25, 1:33 pm, Max <m...@virtualmax.com> wrote:[color=darkred]
> >> TRSCGA & Joe,[/color][/color]
>[color=green][color=darkred]
> >> What motherboard (or motherboard chipset) are you using? Perhaps this
> >> could be related to a specific BIOS or driver incompatibility with
> >> SP1?[/color][/color]
>[color=green][color=darkred]
> >> I'll post mine tonight, as I don't recall which chipset I'm using, and
> >> I'm at work now, so I can't check.[/color][/color]
>[color=green][color=darkred]
> >> =Max=[/color][/color]
>[color=green][color=darkred]
> >> On Mar 24, 4:41 pm, joe.rybi...******.com wrote:[/color][/color]
>[color=green][color=darkred]
> >> > On Mar 24, 11:45 am, TRSCGA <TRS...@discussions.microsoft.com> wrote:[/color][/color]
>[color=green][color=darkred]
> >> > > "Max" wrote:
> >> > > > I have three PCs in my house running Vista. Before installing SP1,
> >> > > > all
> >> > > > of them would routinely go to sleep automatically, as per the power
> >> > > > management settings. Since installing SP1, they continue running
> >> > > > without ever going into sleep mode. I can still enter sleep mode
> >> > > > manually, which works fine, it's just the automatic sleep that
> >> > > > won't
> >> > > > work.[/color][/color]
>[color=green][color=darkred]
> >> > > > Only software in common across all three machines (other than
> >> > > > Vista)
> >> > > > is Office 2007 and Windows Live OneCare. Both were installed prior
> >> > > > to
> >> > > > installing SP1.[/color][/color]
>[color=green][color=darkred]
> >> > > > Thanks for your help,
> >> > > > Max[/color][/color]
>[color=green][color=darkred]
> >> > > Max,
> >> > > I have same problem with my Vista machine. Power management was
> >> > > working
> >> > > fine before SP1. I am also now having the problem with my monitor no
> >> > > longer
> >> > > going to sleep and sometimes having a problem with the screen saver
> >> > > starting.[/color][/color]
>[color=green][color=darkred]
> >> > > Does anybody know of a solutions yet?
> >> > > -TRSCGA[/color][/color]
>[color=green][color=darkred]
> >> > Having the same problem here -- worked great before SP1. No settings
> >> > changed. Anyone have any ideas?[/color][/color][/color]