SuperGrub offers several ways of repairing the mbr, depending upon what it thinks the problem is. Mint uses what is called gfxgrub. SuperGrub does not. If SuperGrub replaces the grub kernel in the mbr with it's own then you will loose the gfxgrub screen.
The moral to this story is you should not be too quick to fix something with SuperGrub, unless you know what you are doing. To avoid creating another problem it is usually better to go a little slower and follow your helper's advice.
There is a line in the menu.lst that calls out the gfxgrub file that contains the pretty screen. That file is called several different things depending on what version of Mint you are using.