service manual or a device not supported by IBM diagnostic tests.If all devices and adapters have been removed, and the problem remains:1. Remove all cables from connectors on the system board except thepower supply and switch cables. See and “System Board Layout” onpage 5-2 for connector locations.2. Remove all SIMMs from sockets.3. Power-on the system unit and listen for any beeps.4. If there are beeps, replace the system board and use the currentprocessor on the FRU system board.5. If there are no beeps, replace the processor and use the current systemboard.6. If there are still no beeps, replace the current system board and use theFRU processor obtained in step 5.Check Procedures 2-71

IBM Aptiva 2159 Manual