Windows 98 and Safe Mode

A PC works great in “Normal Mode”. It has a P2-350 Intel Processor with 128 MB RAM, 2 Hardrives (40GB Maxtor and a 6.4GB WD), 1 CD ROM (Magic Spin 48X) and 1 CD-RW (ACER 6X4X32), Main Video (16MB Diamond Viper 550) and 2 Best Data Voodoo2 cards in dual SLI mode. The problem is the computer will not go into “Safe-Mode”. It works fine in “Normal Mode” but not “Safe Mode”. Any Clues??????