it can only read PC133? I thought it was interchangeable. I know PC133 runs just fine in PC100 slots, it just throttles down. But PC133 slots should be perfectly compatible with PC100s. I know my mom's toshiba laptop takes PC2100, but i was using a PC2700 stick in the second slot. I tried the opposite, and the PC2100 worked just fine in a PC2700 slot. Maybe the stick is just totally dead...

-digital