Usually when a system won't boot in this situation is because the RAM is not compatable with the motherboard. I would suggest that the RAM you require may be PC 66. This number is determined by the front side bus speed of your motherboard.

EDIT: As stated in the posts below that usually higher speed RAM should work at lower speeds. Sometimes it may not be the case, it depends on the BIOS, the age and capabilities of the MoBo and the type of RAM...I worked on a baby ATX last summer. It had FSB of 100 MHz and it simply would not boot with PC 133 RAM installed. It fired up and ran just fine with PC 100 however (same brand of RAM).