Yeah I tried that too but no luck.  I know the Fn button works since I'm always able to pop open the DVD tray.

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> Date: Tue, 9 Sep 2008 08:53:13 -0500
> From: rob.townley@gmail.com
> To: centos@centos.org
> Subject: Re: [CentOS] LCD blanks out overnight
>
> hmmm, usually ctrl-alt f1 would fix this. Sine that isn't working,
> have u tried switching to external vga and back. That did the trick
> for me on Dell Latitude C610's.
>
> On 9/9/08, Joe Tseng <joe_tseng@hotmail.com> wrote:
> > I inherited an ancient Dell Latitude C840 and recently installed CentOS 5.2
> > on it. It worked fine for the most part, but when I left it overnight and
> > came back the next morning, the screen blacked out and wouldn't come back
> > unless I did a hard reset. Even though I turned off all the power
> > management settings and left it set like a desktop, the next morning after
> > that it still blacked out. I thought maybe it'd come back if I switched
> > from X to a virtual text console, but that didn't do the trick. Has anyone
> > seen this and what do I do to fix it?
> >
> > tia,
> >
> > - Joe
> >
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