At the console, that is, while gpm is running. Do you see a cursor on screen? If no, kill gpm and try re-running it with "gpm -t msdos". If you see a cursor now, then your mouse works okay, and you need to start looking at your X config file, and (like the other poster said) make sure you kill gpm before running X.
If you DON'T see a cursor when you move the mouse at the console, (while running "gpm -t msdos") then you need to check the mouse itself, cable, connections and whatnot, or try other mouse types ("gpm -t ps2").
If you can get your mouse to work at the console with gpm, then you should be able to get it to go with X.
Wiggle the mouse! (Score:1)
If you DON'T see a cursor when you move the mouse at the console, (while running "gpm -t msdos") then you need to check the mouse itself, cable, connections and whatnot, or try other mouse types ("gpm -t ps2").
If you can get your mouse to work at the console with gpm, then you should be able to get it to go with X.
Good luck!