The cable connected to an internal DC output module is loose, or the internal DC output module has failed.
Note If you are using a Cisco RPS with a revision level lower than Z3 with a Catalyst 3508G or a Catalyst 3548 XL switch, the switch RPS LED and the RPS DC LED of the connector to the switch might display amber (normally indicating a Cisco RPS malfunction) even when the Cisco RPS is functioning properly. The LEDs display correctly for Cisco RPS revision level Z3 or later. The label on the bottom of the Cisco RPS shows the revision level.