Compaq Armada 7400 Reference Manual page 131

Have you installed all the needed device drivers? For example,
if you are using a mouse, you may need to install a mouse
device driver.
Have you installed the appropriate printer drivers?
While the computer is configured just for you, problems you
encounter while working may not be unique. Eliminating the
typical problems described in this section may save you time and
money. If you have a problem with the computer, consider the
problems and possible solutions outlined in troubleshooting. If the
problem appears related to a software application, also check the
documentation provided with the software. You may discover
something you can resolve easily by yourself. If the condition
persists, contact your Compaq authorized dealer, reseller, or
service provider.
Troubleshooting