Ctrl + " Doesn't work

the function Ctrl + " to copy the cell above does not work on my home
computer to copy a cell above. On all other computers I've used this
shortcut works.
What can I do to fix this?
--
Thanks, Yo

Sir/ Madam,

Somebody might have assigned that keyboard short for some macro or some
other command.

Regards,

NAVEEN.

"Yolaluvs3" wrote:

> the function Ctrl + " to copy the cell above does not work on my home
> computer to copy a cell above. On all other computers I've used this
> shortcut works.
> What can I do to fix this?
> --
> Thanks, Yo