Did you overclock the gfx card? Check the P96's PVS (P96 Variable Setter), tooltypes (uncheck the overclock, set the memory clock at 55 MHz).
Run the "Pointer" prefs, press right-Amiga&"D" (set default pointer), and save the new setting. Then reboot and check the pointer (might be trashed-corupted the previous prefs file).
Check the hardware itself (how is it inserted? fits right to the zorro slot?)
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FULL MELT BUBBLE HASH