IBM x3400 Installation Guide - Page 96
Intermittent, problems
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v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved. v See the parts listing in the Problem Determination and Service Guide to determine which components are customer 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 a trained service technician. Symptom Action A hard disk drive was not detected while the operating system was being started. Reseat all hard disk drives and cables; then, run the hard disk drive diagnostic tests again. A hard disk drive passes the diagnostic Fixed Disk Test but the problem remains. Run the diagnostic SCSI Attached Disk Test (see "Running the diagnostic programs" in the Problem Determination and Service Guide on the IBM System x3400 Documentation CD). Note: This test is available on servers that have RAID arrays that uses the onboard SAS/SATA controller or servers that have SATA hard disk drives that are connected to the onbaord SAS/SATA controller. Intermittent problems v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved. v See the parts listing in the Problem Determination and Service Guide to determine which components are customer 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 a trained service technician. Symptom Action A problem occurs only occasionally and is difficult to diagnose. 1. Make sure that: v All cables and cords are connected securely to the rear of the server and attached devices. v When the server is turned on, air is flowing from the fan grille. If there is no airflow, the fan is not working. This can cause the server to overheat and shut down. 2. Check the system/event error log (see "Error logs" in the Problem Determination and Service Guide on the IBM System x3400 Documentation CD). 82 System x3400 Types 7973, 7974, 7975, and 7976: Installation Guide