TROUBLESHOOTING
BEEPS ERROR MESSAGE 1’s - System RAM refresh failure the programmable interrupt timer (PIT) or programmable interrupt controller (PIC) has probably failed. Replace the motherboard. 2’s - Memory parity error. A parity error has been detected in the first 64KB of RAM. The RAM IC Is probably defective. Replace the memory or motherboard. 3’s - Base 64KB memory failure. A memory failure has been detected in the first 64KB of RAM. The RAM IC Is probably defective. Replace the memory or motherboard. 4’s - System timer failure. The system clock/timer IC has failed. 5’s - CPU failure. The system CPU has failed. Try replacing the motherboard or CPU. 6’s - Gate A20 failure. The keyboard controller IC has failed, so Gate A20 Is no longer available to switch the CPU into protected mode. Replace the keyboard controller or motherboard. 7’s - Exception error. The CPU has generated an exception error because of a fault in the CPU or some combination of motherboard conditions. Try replacing the motherbo...