it shouldn't...some geforce2mx don't even need a fan but just a heatsink to run. how is your room temperature? do you have cards directly underneath your geforce2mx? sounds like an air flow problem if sticking fan solves the problem. try moving any cards underneath the geforce2mx couple slots lower, or invest in a slot fan.
Athlon XP 1.58GHz | MSI KT3 Ultra2 | 256MB DDR PC-3000 | GeForce 4 ti4200 64mb @ 310/533 | IBM 120GXP 40.0GB | Det. 41.09 | DX 9 RC2 | Win XP SP1