[all variants] Boot to grub rescue

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http://ubuntuforums.org – Hello hello ! So after an install of Ubuntu, Lubuntu and a switch to pure Lubuntu, I take out the Boot CD. Booting to CD is my 3rd boot option, my second is a hard disk with free space, the 1st is the harddisk option I use to boot. Problem is, upon starting, its goes straight to "Grub Rescue" and doesn't boot to Lubuntu. To make it boot, I need to press F11 and manually pick where to boot. Any idea to how to prevent the computer from going to this grub rescue screen ? Thanks ! Jo (Hardware)