How to Reset the CMOS on a Compaq EVO D510 CMT

Written by bonnie conrad
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How to Reset the CMOS on a Compaq EVO D510 CMT
Resetting CMOS clears your computer settings. (computer with sales chart on screen image by patrimonio designs from

The CMOS settings are where your computer stores information about the amount of memory installed in the computer, the size of the hard drive and any add-on devices on the unit. When these settings become corrupted, the computer can behave in unexpected ways. Clearing the CMOS settings allows the Compaq D510 to recover from these problems by restoring the proper settings. Clearing the CMOS is not difficult, but you do need to follow the proper steps.

Skill level:

Things you need

  • D510 PC

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  1. 1

    Turn off the Compaq D510 and remove the power cord from the back of the unit. Locate the two small tabs on the front of the case and press in on them.

  2. 2

    Pull the case toward you to remove the cover. Set the cover aside while you work inside the unit.

  3. 3

    Locate the small blue button on the motherboard. This is the CMOS button. Press that button firmly and hold it in for 30 seconds.

  4. 4

    Replace the power cord and power on the D510. Wait for the memory count to complete, then press "F1" to continue the boot process. The computer will re-establish its settings and save them.

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