IBM 847651U Handbook - Page 227

POST beep codes POST beep code tables In the following tables, the numbers indicate the sequence and number of beeps. For example, a "2-3-2" error symptom (a burst of two beeps, three beeps, then two beeps) indicates a memory module problem. If the following beep codes occur, have the system serviced. Beep Code 1-1-3 1-1-4 1-2-1 1-2-2 1-2-3 1-2-4 1-3-1 1-3-2 2-1-1 2-1-2 2-1-3 2-1-4 2-2-2 2-3-2 2-3-3 3-1-1 3-1-2 3-1-4 3-2-4 3-3-1 Probable Cause CMOS write/read failure BIOS ROM checksum failure Programmable interval timer test failure DMA initialization failure DMA page register write/read test failure RAM refresh verification failure First 64 K RAM test failure First 64 K RAM parity test failure Secondary DMA register test in progress or failure Primary DMA register test in progress or failure Primary interrupt mask register test failure Secondary interrupt mask register test failure Keyboard controller test failure Screen memory test in progress or failure Screen retrace tests in progress or failure Timer tick interrupt test failure Interval timer channel 2 test failure Time-of-day clock test failure Comparing CMOS memory size against actual Memory size mismatch occurred Chapter 5. Solving problems 193