IBM IntelliStation 6866, Hardware Maintenance Manual, Page: 74 / 148

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IBM IntelliStation Type 6866: Hardware Maintenance Manual
No-beep symptoms
POST error codes
Each time you power-on the system, it performs a series of tests that check the
operation of the system and some options. This series of tests is called the Power-On
Self-Test, or POST. POST does the following operations.
• Checks some basic system-board operations
• Checks the memory operation
• Starts the video operation
• Verifies that the diskette drive is working
One long and one short beep during POST.Base 640 KB
memory error or shadow RAM error 1. Memory Module
2. System Board
One long beep and two or three short beeps during
POST.(Video error) 1. Video Adapter (if installed)
2. System Board
Three short beeps during POST 1. See “System board memory” on page 18.
2. System Board
Continuous beep 1. System Board
Repeating short beeps 1. Keyboard stuck key?
2. Keyboard Cable
3. System Board
Important:
Type 6866 computers default to come up quiet (no beep and no memory count and checkpoint code
display) when no errors are detected by POST.
To enable beep and memory count and checkpoint code display when a successful POST occurs, do the
following:
1. Select Start Options in the Configuration/Setup Utility program (see “Setup Utility program” on
page 5“).
2. Set Power-On Self-Test to Enhanced.
Symptom/Error FRU/Action
No beep during POST but computer works correctly. 1. System Board
No beep during POST. 1. See “Undetermined problems” on page 81.
2. System Board
3. Memory Module
4. Any Adapter or Device
5. Power Cord
6. Power Supply
Beep Symptom FRU/Action