[ubuntu] Dual Boot Windows/Ubuntu - Keyboard Failure on boot up

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http://ubuntuforums.org – Good Morning, I have a Dell Pc, which has Ubuntu Natty 11.04 dual booted with Windows vista. It has run fine before and i used to access the grub menu with no problems to access both OS's. Suddenly without reason, when i boot up i now get 'keyboard failure' after the BIOS splash and i am unable to use the keyboard up and down arrows to access the grub menu. Once Ubuntu has booted up the keyboard is fine again. Is all lost? I know i can alter the grub boot sequence to make windows boot up first, but how then do i access ubuntu? Do i have to choose which OS to run with? Meddy. (Hardware)