I would say if you had a secondary hard drive to back up all the data to
that, wipe all the partitions then create a MBR to overwrite the GPT table.
I doubt it but gParted may be able to convert it over, never tried it
before. Other then that, I don't really know of any other way.
On Jun 7, 2012 1:50 PM, "Tim Holloway" <[email protected]> wrote:

> This may prove informative:
>
> http://www.rodsbooks.com/gdisk/booting.html
>
> The simplest solution would be to nuke the GPT and fdisk in a
> traditional MBR to replace it, but that isn't something that you'd want
> to do if there's existing data at risk. You could reconstruct the
> essential parts of the GPT in MBR form if you were very brave, though.
>
> On Wed, 2012-06-06 at 18:41 -0400, Dan Bidleman wrote:
> > You may need to use a MBR style partition instead of a GPT.  Try
> > changing it before you use the installer using parted.
> >
> > On Tue, Jun 5, 2012 at 8:06 AM, brett michaels <[email protected]>
> wrote:
> > > I had been trying to install Centos 6.2, but never got any further than
> > > those dark blue circles, but then tried Ctrl+ALT+F2.
> > > Then typed in "root", followed by,"anaconda".
> > > Things were going well until the actual attempt at installing was made.
> > > There was the following warning:
> > > "You are trying to install a GPT boot disk on an non-EFI system. This
> may
> > > not work".
> > > Well, it didn't. After exiting the installer, there was a black screen
> and
> > > the cursor.
> > > I tried various attempts at exiting, but eventually ended up hitting
> the
> > > "Reset" button.
> > > I googled and googled, but ASUS does not offer any BIOS upgrade for
> this
> > > particular motherboard(P5N-D).
> > > Is there some way to upgrade without loss of data or shorting out the
> > > motherboard?
> > > Is there some sort of workaround?
> > > Or should I just try installing an older version of Centos?
> >
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