[SOLVED]Grub broken - nvidia unknown parameter "audio" error

[sdim]

Hi, everyone.
I'm running LMDE.
After trying to fix a sound problem with an HDMI cable that connects the pc with the monitor, I modified a line in etc/default/grub and now I have an unbootable system.
The error is :

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nvidia unknown parameter "audio"

The tip was here-->http://forums.linuxmint.com/viewtopic.php?f=196&t=79777
After the modification, I tried and erased from the file etc/default/grub the words that caused the issue, but even after updating the grub in the terminal, nothing changed.
I even tried Rescatux, but again, the issue remains.

Any help would be appreciated.
Many thanks.

[xenopeek]

Okay, can you confirm you changed the line in /etc/default/grub back to:

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GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

And then did:

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sudo update-grub

[sdim]

Thanks for the answer.
When I try to update the grub it tells me:

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/usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).

[sdim]

Nope...It doesn't work.
I get the same error message and the system is still unbootable...

[sdim]

Solution found.
Thanks to twiner, a colleague from Insomnia (http://www.insomnia.gr/), I finally managed to do it. It goes like this:

Although I had managed to correct etc/default/grub through the live Mint Debian DVD, the changes couldn't be saved to the disk.
So, twiner advised me to press e during boot and edit the Mint entry, erasing the words that caused the issue.
I did, and thus I was able to enter the OS and having once more corrected etc/default/grub, I gave a sudo update-grub in Terminal, which updated the Grub, and got it back as it initially was.

Many thanks for all the help.