Abstract: IBM PC300GL MACHINE TYPE 6561/6591 SERVICE TIPS TEXT: When trouble-shooting hardware problems in the IBM PC300GL, machine types 6561 and 6591, always check the following items BEFORE replacing any hardware. 1. Verify the system board is fully inserted in the riser card. There is an alignment mark on the system chassis which will be visible when the system board is fully seated. This alignment mark should line up with the edge of the front system board rail. See the HMM System Board Removal and Installation section for the diagram. 2. Verify the processor speed setting in the Configuration Setup Utility matches the correct processor speed for that model. The processor speed on these systems is selected from the Setup Utility, not with system board jumpers. If the user selects the wrong processor speed in Setup, the system may fail with unpredictable symptoms. If necessary, inspect the text printed on the Pentium II processor for its actual rated speed. 3. Verify the BIOS was flashed if either the system board or processor was replaced. Even if the system is at the most current BIOS level, the BIOS should be re-flashed. When flashing these systems, certain BIOS components are selected and loaded, depending on the hardware installed. Even if the system board or processor was replaced with the same speed and FRU number, it may still be at a different hardware (step) level, which would cause different BIOS components to load during the flash process. 4. Verify the Pentium II processor is fully seated. If an error condition exists after replacing a processor, or, if an error condition exists in an "out-of-box" system, verify that the Pentium II processor is fully seated. The Pentium II type processor will provide an audible "click" when seated correctly into the socket. Press firmly and evenly on both ends of the processor when replacing or re- seating. Pentium and Pentium II are trademarks of Intel Corporation. SAS KEYWORDS: PSY2 PSY2BRD PSY2MCD PSY2PART PSVP PSVPBRD PSVPMCD PSVPPART D/T6561 D/T6591 6561 6591 UNCLASSIFIED