Here is a replacement "MX" BIOS Chip for Compaq Presario 900 and 1500 series laptops listed below. Part is in perfect condition! Lost your password to log in to your computer? Simply replace this chip and your problem is solved! Also fixes other Bios related issues and also sometimes fixes issues with no power. NOTE: This Bios chip is not essentially model specific so it will work on all Compaq Presario 900 and Compaq Presario 1500 models.