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 logs (see “Using the Configuration/Setup Utilityprogram” on page 32).USB 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. See http://www.ibm.com/servers/eserver/serverproven/compat/us/ for keyboardcompatibility.2. Make sure that:v The keyboard cable is securely connected.v The server and the monitor are turned on.3. Move the keyboard cable to a different USB connector.4. Replace the following components one at a time, in the order shown, restartingthe server each time:a. Keyboardb. (Only if the problem occurred with a front USB connector) Internal cables tothe operation information panelc. (Only if the problem occurred with a front USB connector) Operatorinformation paneld. (Trained service technician only) System boardChapter 5. Solving problems 45