If Your Keyboard Does Not Work; If Your Mouse Does Not Work - HP Net Vectra User Manual

2 Troubleshooting Your PC
If Your PC Has a Hardware Problem

If Your Keyboard Does Not Work

Ensure that the keyboard is correctly connected to the PC.
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Ensure that no keys are stuck on the keyboard.
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Ensure that no liquids have been spilled on the keyboard.
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If you turn on your PC, the operating system boots, the keyboard is
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correctly connected and does not work, the power-on password may
be set to "keyboard locked". You will need to enter a password to
unlock the keyboard (and mouse).

If Your Mouse Does Not Work

Ensure that the mouse is correctly connected to the PC.
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Ensure that the mouse driver supplied with the preloaded software
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is installed correctly.
Clean the mouse ball and rollers as shown in the figure below (use a
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non-residual contact cleaner).
Cleaning the mouse rollers
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Cleaning the mouse ball