Table 4. Light path diagnostics panel LEDs (continued)v Follow the suggested actions in the order in which they are listed in the Action column until the problem issolved.v See “Parts listing” to determine which components are customer replaceable units (CRU) and whichcomponents are field replaceable units (FRU).v If an action step is preceded by “(Trained service technician only)”, that step must be performed only by atrained service technician.LED Description ActionBRD An error has occurred on thesystem board. 1. Check the LEDs on the system board to identify thecomponent that caused the error. The BRD LED can be litdue to any of the following reasons:v Batteryv Missing PCI riser-card assemblyv Failed voltage regulator2. Check the system-error log for information about theerror.3. Replace any failed or missing replacement components,such as the battery or PCI riser-card assembly.4. If a voltage regulator has failed, (trained servicetechnician only) replace the system board.Rear viewUse this information to view the controls, LEDs, and connectors on the rear of theserver.The following illustration shows the connectors and LEDs on the rear of the server.v PCI slot 1: Insert a low-profile PCI Express or PCI-X adapter into this slot. Youcan purchase an optional PCI Express or PCI-X riser-card assembly with bracketif you want to install a PCI adapter in this slot.v PCI slot 2: Insert a half-length, full-height PCI Express or PCI-X adapter intothis slot. Standard models of the server come with one PCI Express riser-cardassembly installed in this slot. You can purchase an optional PCI-X riser-cardassembly with bracket if you want to install a PCI-X adapter in this slot.v Power cord connector: Connect the power cord to this connector.v Video connector: Connect a monitor to this connector. The video connectors onthe front and rear of the server can be used simultaneously.Figure 9. Rear view26 IBM System x3550 M3 Type 4254 and 7944: Installation and User's Guide
