Když počítač startuje po „studeném“ startu, BIOS základní desky nejprve detekuje interní hardwarovou konfiguraci a provádí autotest (power-on self-test – POST). POST se sestává z několika diagnostických testů základních funkcí napájení, základní desky, procesoru, vstup/výstuního řadiče, paměti (RAM), klávesnice a video komponent. Pokud narazí na chybu, dá ji najevo počtem (délkou) pípnutí reproduktoru.
Bohužel neexistuje standard pro tyto zprávy a proto se každý BIOS chová jinak. V následující tabulce je shrnutí nejpoužívanějších BIOSů a jejich hlášení.
AMI BIOS beep codes http://www.ami.com/support/bios.htmlhttp://www.ami.com/support/doc/AMIBIOS-codes.pdf |
||
Number of beeps | Problem description | Troubleshooting recommendation |
1 | Memory refresh timer error | Reseat memory or replace with known good chips. |
2 | Parity error | Reseat memory or replace with known good chips. |
3 | Base 64K memory read/write test failure | Reseat memory or replace with known good chips. |
4 | Motherboard timer not operational | Repair/replace motherboard. |
5 | Processor error | Repair/replace motherboard. |
6 | 8042—gate A20 failure/Keyboard controller BAT test error | Reseat keyboard controller chip, replace keyboard controller chip, check for a keyboard fuse, or try a different keyboard. |
7 | Processor exception interrupt error | Repair/replace motherboard. |
8 | Display memory read/write failure | Replace video card or video card memory. |
9 | ROM checksum error/Faulty BIOS chips | Replace chips or motherboard. |
10 | CMOS shutdown register read/write error | Repair/replace motherboard. |
11 | Cache memory bad | Repair/replace motherboard. |
AwardBIOS beep codes http://www.phoenix.com/en/Customer+Services/BIOS/AwardBIOS/Award+Error+Codes.htm |
||||
Number of beeps | Problem description | Troubleshooting recommendation | ||
1 long & 2 short | Video error | Check the video card. | ||
Any other beeps | RAM problem | Reseat the RAM or replace with known good chips. | ||
1 short | System boots successfully | |||
2 short | CMOS setting error | |||
1 long 1 short | DRAM or M/B error | |||
1 long 2 short | Monitor or display card error | |||
1 long 3 short | Keyboard error | |||
1 long 9 short: | BIOS ROM error | |||
Continuous long beeps | DRAM error | |||
Continuous short beeps | Power error | |||
PhoenixBIOS beep codes http://www.phoenix.com/en/Customer+Services/BIOS/BIOS+FAQ/default.htm#Q12http://www.phoenix.com/NR/rdonlyres/81E6C43C-93BD-4097-A9C4-62F05AAD6025/0/biospostcode.pdf |
||
Unfortunately, PhoenixBIOS beep codes are significantly more complicated than other BIOS manufacturers. Instead of a single beep code set, PhoenixBIOS codes consist of a series of beep code sets separated by a short pause. Older Phoenix BIOS Plus and PhoenixBIOS 1.x systems used a series of three sets, while the PhoenixBIOS 4.x systems use a series of four sets. The codes listed below are only some of the more than 100 codes for the PhoenixBIOS 4.x. For a complete list of Phoenix BIOS POST task routines and beep codes, please visit their Web site or review your motherboard’s documentation. | ||
Number of beeps | POST routine description/problem | Troubleshooting recommendation |
1 | One short beep before boot | Normal operation |
1-1-1-3 | Verify real mode | A problem exists with the CPU and/or motherboard. Check and replace if necessary. |
1-1-2-1 | Get CPU type | A problem exists with the CPU and/or motherboard. Check and replace if necessary. |
1-1-2-3 | Initialize system hardware | A problem exists with the motherboard. Check and replace if necessary. |
1-1-3-1 | Initialize chipset with initial POST values | A problem exists with the motherboard. Check and replace if necessary. |
1-1-3-2 | Set IN POST flag | A problem exists with the motherboard. Check and replace if necessary. |
1-1-3-3 | Initialize CPU registers | A problem exists with the CPU and/or motherboard. Check and replace if necessary. |
1-1-4-3 | Initialize I/O component | A problem exists with the I/O port hardware or a device connected to an I/O port. It could also be an expansion device in the PC or the motherboard. |
1-2-2-1 | Initialize keyboard controller | An error has occurred with the keyboard or keyboard controller. Try a new keyboard or replace the keyboard controller on the motherboard. |
1-2-2-3 | BIOS ROM checksum | Replace either the BIOS ROM chip or the motherboard. |
1-2-3-3 | 8237 DMA controller initialization | Check the motherboard and any expansion cards that use DMA. |
1-3-1-1 | Test DRAM refresh | Check the first bank of memory and the motherboard. |
1-3-1-3 | Test 8742 keyboard controller | An error has occurred with the keyboard or keyboard controller. Try a new keyboard or replace the keyboard controller on the motherboard. |
1-3-4-1 | RAM failure on line xxxx | Check the first bank of memory and the motherboard. |
1-3-4-3 | RAM failure on data bits xxxx of low byte memory bus | Check the first bank of memory and the motherboard. |
2-1-3-1 | Check video configuration against CMOS | Check the video card or video card memory. |
2-1-3-2 | Initialize PCI bus and devices | A problem exists with the I/O port hardware or a device connected to an I/O port. It could also be an expansion device in the PC or the motherboard. |
2-2-1-3 | Test keyboard |