On Wed, 2012-04-25 at 11:51 -0600, JD wrote:
> After upgrading from fc14 to fc16 using DVD iso,
> I booted up after the upgrade, and tried to log in
> on the gnome welcome screen.
> Well, I got the blue screen but my desktop never
> came up and a banner popped up
> Oooops - something went wrong ... logout and try again.
>
> I was never able to go beyond that no matter how many
> times I retried.
>
> Then I performed the updates.
> After the updates, I rebooted.
>
> Now I get no gnome welcome screen.
> The screen stays  blank, and the
> disk activity light on the computer remains on,
> until I press the Return key. After that the
> disk activity light goes out, and screen remains blank.
>
> PS: my graphics chip is the legacy Radeon Mobility 9600/M10
>
> I tried to switch to any one of the vty's
> (Control-Alt F2 or F3 or F4) to no avail. Nothing happens.
>
> Any ideas what to look at and fix in single user mode?
>
> Thanx,
>
> JD

My prejudice would not to upgrade but to install F16 as a new
installation. There so many differences between F14 and F16 that I would
not trust an automatic upgrade to work.
But on the other hand some people do this and it works.