Having troubles booting

[newW2]

Is Mint the only OS on this machine?

[catweazle]

Could you tell us the exact error message you get at boot (error 15 or error 22 ...) ?

You can restore the boot loader from the liveCD like this :

Once started, GRUB will show the command-line interface (see Command-line interface). First, set the GRUB's root device4 to the partition containing the boot directory, like this:

grub> root (hd0,0)

If you are not sure which partition actually holds this directory, use the command find (see find), like this:

grub> find /boot/grub/stage1

This will search for the file name /boot/grub/stage1 and show the devices which contain the file.

Once you've set the root device correctly, run the command setup (see setup):

grub> setup (hd0)

This is a quote from the grub manual

Success