Compaq Presario 1800 Presario Select 1800 Series Maintenance and Service Guide - Page 24
Troubleshooting - cmos battery
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Maintenance & Service Guide Presario 1800 Series Models: 1825 and 1800T | Home Page | Notice | Preface | Product Description | Troubleshooting Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications Pin Assignments | Battery Pack Operations Troubleshooting Clearing the Power-on Password Clearing the power-on password requires removing all Setup attributes that are programmed in the CMOS. The RTC battery is located on the system board directly forward of the fan. If the password is not known, clear it by performing the following steps: 1. Turn off the computer. 2. Disconnect the power cord. 3. Remove the battery pack. 4. Remove the palmrest cover with touchpad. 5. Remove the keyboard. 6. Remove the heatspreader. 7. Slide the black switch toward the front of the computer to clear CMOS. Hold the switch in the forward position for at least 15 seconds to ensure that the password is cleared. The switch is located on the back of the DVD or CD drive in the middle of the system board. 8. Reassemble the computer. 9. Turn on the computer to verify that the power-on password has been cleared. If it has not been cleared, repeat Steps 1 through 9. Return to Troubleshooting