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You can resolve many system problems by resetting the logic board. There are three reset switches on the logic board that you can use to troubleshoot various issues: SMC reset: If the computer is experiencing a power issue, resetting the system management controller (SMC) may resolve it. RTC reset: If the computer is experiencing a booting issue, resetting the Real Time Clock (RTC) may resolve it. System reset: You can use this switch to determine if a computer that won’t consistently boot from a cold start has power supply issues. located in the upper right-hand corner of the logic board What are the diagnostic LEDs telling you? The LEDs are located toward the rear of the logic board, under the memory cage, next to PCI card slot 1. You can view these LEDs by removing the computer’s side access panel and looking through the memory cage to the logic board below.