Gateway 7250R System Manual page 52

Turn off the server, remove the cover, and make sure that all cables inside
the case are attached securely. Also, make sure that the colored cable edges
are aligned correctly and that the connectors did not miss any pins.
Disconnect and reconnect the cables. Close the case as described in
"Closing the case" on page 20, reconnect the modem and power cords,
then turn on the server.
Turn off the server, remove the cover and, if you have the proper test
equipment, make sure that the new battery has power. (Although
unlikely, your new battery may be defective.) Close the case as described
in "Closing the case" on page 20, reconnect the power cord, then turn
on the server.
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Replacing the battery