i have a G4/400MhZ with 512Moram and a the ati rage 128 (bad graphic card) but maya 3.5 works perfectly on my computer ! there is no problem
but iI THINK u have an "illegal" copy of maya....
i m not very sure but it could be a reason..
Sorry but my english is very poor !
MaY ThE FoRcE Be WiTh YoU !