The logic board, or motherboard, is the central electronic circuit board that all data passes through in a computer. The motherboard houses the CPU and RAM. All peripheral components connect to the motherboard. As the central connection point for a computer, when the logic board begins to fail, the computer behaves erratically.
Random Reboots
Under normal computer operations, the computer stays active and does not reboot itself unless you or another piece of software tells it to. A symptom of a bad logic board is a random reboot. As time progresses, the random reboots become worse due to weakening components and electrical signals passing through the motherboard.
Corrupt Data
A bad logic board does not calculate and pass data correctly through the bus. This leads to data corruption both in RAM and on physical storage such as hard drives. Like random rebooting, this may be erratic and inconsistent.
No Power.
A bad logic board may not power up at all. In this situation, it is important to test the computer's power supply to ensure it is working correctly. If the power supply works, but the computer does not power on, the logic board has gone bad.
Electrical Failure
A failed logic board can be accompanied by smoke or even a fire if one or more of the electrical components, such as a capacitor, have gone bad on the board.
Warning Beeps
A failing logic board may warn you with a series of beeps. Refer to the motherboard owner's documentation to determine what the different beep codes stand for.
Error Codes Displayed on Screen.
Some logic boards display error codes on the monitor before they completely fail. Refer to your owner's documentation to determine what the different displayed codes stand for.
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