If you are continuing to receive new errors that are not starting with 2900 then that would indicate that device is failing and or failed and would need replacement.  The ROMB battery is the battery connected to the Storage controller in the server. Here is picture of the battery labeled BBU (Battery Backup).  And the CMOS is the coin cell battery on the motherboard of the server.   [IMAGE]
After reading another post, I downloaded and ran the hardware diagnostics with the following results: Test #1 Memory Tests all passed. Test #2 Two Errors found: Error-code: 2900:0221with multiple messagesIPMI :system board: Voltage Sensor Proc VTT State Asserted IPMI :system board: Voltage Sensor 1.5 VPG State Asserted IPMI :system board: Voltage Sensor 1.8 VPG State Asserted CMOS Battery below critical Voltage Sensor ROMB Battery  2900:0325 ROMB Battery State Asserted Are these Bad Power Supply & CMOS BatteriesCan I continue to use server while I wait for parts? And can you include a link for ordering parts Many thanks.
Power Edge 840 Amber Light with Green Lights