Macbook startup keyboard shortcuts not working
My Mac formatted partition on my Macbook is corrupt so I am trying to boot from a disk in order to try and either repair the partition or to reinstall Mac OSX.
When I try and hold either alt or C nothing happens, it just attempts to boot as per usual with no visible change in the boot.
For information I have used the shortcuts before and they worked,
I am running OSX Lion,
I have a late 2011 MBP,
I am using the inbuilt keyboard (I have tried other keyboards),
If I hold alt it should give me the option to choose Lion Recovery, Bootcamp or Lion.
Thanks if anyone can help!
MacBook Pro, Mac OS X (10.7)