What is the post test
Full meaning of POST is Power on self test. POST checks CPU, Power supply, BIOS, I/O bus controller etc to make sure that all hardware is working properly before starting the remainder of the boot process. When the computer passes the POST the computer create a single beep as the computer starts and the computer will continue to start normally.
If computer create two, three or more beeps means there has some problem. You can avail to understand your computer problem from several type of beeps. Beep code may be different because of different computer manufacturers company. However, bellow is given a short list of POST code.
IBM BIOS beep codes
Bellow is given IBM BIOS beep code description
| Beep type | Issue |
|---|---|
| No beeps | No Power, Loose card, or short |
| Continuous beeps | No Power, Loose card, or short |
| Continuous short beeps | No Power, Loose card, or short |
| One short beeps | Computer is starting normally. |
| Two short beeps | POST error, Check monitor screen. |
| One long & one short beeps | Motherboard issue. |
| One long & two short beeps | Graphics card issue. |
| One long & three short beeps | Graphics card issue. |
| Three long beeps | Keyboard issue. |
| Any others beep | RAM issue. |
AMI BIOS beep codes
Bellow is given AMI BIOS beep codes description
| Beep type | Issue |
|---|---|
| One short beep | DRAM Refresh failure. |
| Two short beep | Parity circuit failure. |
| Three short beep | BAS 64K RAM failure. |
| Four short beep | System timer error. |
| Five short beep | Process failure. |
| Six short beep | Keyboard controller gete A20 error. |
| Seven short beep | Virtual mode exception error. |
| Eight short beep | Display memory read/write test failure. |
| Nine short beep | ROM BIOS issue. |
| ten short beep | CMOS issue. |
| Eleven short beep | Cach memory issue. |
AWARD BIOS beep codes
Bellow is given AWARD BIOS beep code description
| Beep type | Issue |
|---|---|
| One long two short beeps | Video card issue. |
| Any others beep | RAM issue. |
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