IBM System x3950 E Installation Manual

Also see for 8878: Problem determination and service guide

Intermittent problemsv Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See the parts listing in the Problem Determination and Service Guide to determine which components arecustomer replaceable units (CRU) and which components 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.Symptom ActionA problem occurs onlyoccasionally and is difficult todiagnose.1. Make sure that:v All cables and cords are connected securely to the rear of the server andattached devices.v When the server is turned on, air is flowing from the fan grille. If there is noairflow, the fan is not working. This can cause the server to overheat andshut down.2. Check the system-error log or BMC log.Keyboard, mouse, or pointing-device problemsv Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See the parts listing in the Problem Determination and Service Guide to determine which components arecustomer replaceable units (CRU) and which components 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.Symptom ActionAll or some keys on thekeyboard do not work. 1. If the server is attached to a KVM switch, bypass the KVM switch to eliminate itas a possible cause of the problem: connect the keyboard cable directly to thecorrect connector on the rear of the server.2. Make sure that:v The keyboard cable is securely connected to the server and the keyboardand mouse cables are not reversed.v The server and the monitor are turned on.3. Reseat the following components:a. Keyboardb. I/O board4. Replace the components listed in step 3 one at a time, in the order shown,restarting the server each time.62 IBM System x3950 Type 8878 and System x3950 E Type 8879: Installation Guide