Quando ci sono problemi alla partenza di un PC il BIOS emette dei codici sonori (Beep) che sono associati ad un determinato errore.
Questa guida contiene i relativi codici di errore associati alla quantità dei Beep emessi dal computer per i principali BIOS (AMI, AWARD, PHOENIX, IBM) e la relativa possibile soluzione:
BIOS "AMI"
| Numero di Beep | Descrizione dell'errore | Possibile soluzione |
| 1 Beep | Memory refresh timer error | - Togli e rimetti i moduli di RAM - Provane uno alla volta - Sostituisci la RAM difettosa |
| 2 Beeps | Parity error in base memory (first 64KB block) | - Togli e rimetti i moduli di RAM - Provane uno alla volta - Sostituisci la RAM difettosa |
| 3 Beeps - | Base memory read/write test error | - Togli e rimetti i moduli di RAM - Provane uno alla volta - Sostituisci la RAM difettosa |
| 4 Beeps | Motherboard timer not operational | |
| 5 Beeps | Processor error | |
| 6 Beeps | 8042 Gate A20 test error (cannot switch to protected mode) | |
| 7 Beeps | General exception error (processor exception interrupt error) | |
| 8 Beeps | Display memory error (system video adapter) | |
| 9 Beeps | AMIBIOS ROM checksum error | |
| 10 Beeps | CMOS shutdown register read/write error | |
| 11 Beeps | Cache memory test failed | |
| 1 Lungo + 3 Brevi Beeps | You've probably just added memory to the motherboard since this is a conventional or extended memory failure. Generally this is caused by a memory chip that is not seated properly. |
- Togli e rimetti i moduli di RAM |
| 1 Lungo + 8 Brevi Beeps | Display / retrace test failed. | - Togli e rimetti la scheda Video |
BIOS "AWARD"
| N° Beep | Descrizione dell'errore | Possibile soluzione |
| 1 Beep Lungo, 2 Beeps brevi | Video adapter error | - Togli e rimetti la scheda video. - Sostituisci la scheda video. - Se la scheda video è integrata, prova ad aggiungerne una PCI o AGP esterna. |
| 1 Beep Lungo, 3 Beeps brevi | No video card is present or video RAM is bad | - Togli e rimetti la scheda video. - Sostituisci la scheda video. - Se la scheda video è integrata, prova ad aggiungerne una PCI o AGP esterna. |
| Beep Alto-Picco/Beep Basso-picco alternati (e ripetuti) | Processor error | - Togli e rimetti la CPU. - La CPU è danneggiata, sostituirla. |
| Beep Alto-Picco ripetuti | Processor overheating | - Surriscaldamento CPU. - Pulisci o sostituisci la ventola del processore - Togli e rimetti la CPU. - La CPU è danneggiata, sostituirla. |
| Tutti gli altri tipi di Beep | Memory error | - Togli e rimetti i moduli di RAM - Provane uno alla volta - Sostituisci la RAM difettosa |
BIOS "PHOENIX"
| N° Beep | Descrizione dell'errore |
| 1-1-3 | Your computer can't read the configuration info stored in the CMOS. Replace the motherboard. |
| 1-1-4 | Your BIOS needs to be replaced. |
| 1-2-1 | You have a bad timer chip on the motherboard. You need a new motherboard. |
| 1-2-2 | The motherboard is bad. |
| 1-2-3 | The motherboard is bad. |
| 1-3-1 | You'll need to replace the motherboard. |
| 1-3-3 | You'll need to replace the motherboard. |
| 1-3-4 | The motherboard is bad. |
| 1-4-1 | The motherboard is bad. |
| 1-4-2 | Some of your memory is bad. |
| 2-_-_ | Any combo of beeps after two means that some of your memory is bad, and unless you want to get real technical, you should probably have the guys in the lab coats test the memory for you. Take it to the shop. |
| 3-1-_ | One of the chips on your motherboard is broken. You'll likely need to get another board. |
| 3-2-4 | One of the chips on your motherboard that checks the keyboard is broken. You'll likely need to get another board. |
| 3-3-4 | Your computer can't find the video card. Is it there? If so, try swapping it with another one and see if it works. |
| 3-4-_ | Your video card isn't working. You'll need to replace it. |
| 4-2-1 | There's a bad chip on the motherboard. You need to buy another board. |
| 4-2-2 | First check the keyboard for problems. If nothing, you have a bad motherboard. |
| 4-2-3 | Same as 4-2-2. |
| 4-2-4 | One of the cards is bad. Try yanking out the cards one by one to isolate the culprit. Replace the bad one. The last possibility is to buy another motherboard. |
| 4-3-1 | Replace the motherboard. |
| 4-3-2 | See 4-3-1 |
| 4-3-3 | See 4-3-1 |
| 4-3-4 | Time of day clock failure. Try running the setup program that comes with the computer. Check the date and time. If that doesn't work, replace the battery. If that doesn't work, replace the power supply. You may have to replace the motherboard, but that is rare. |
| 4-4-1 | Your serial ports are acting up. Togli e rimetti, or replace, the I/O card. If the I/O is on the motherboard itself, disable them with a jumper (consult your manual to know which one) and then add an I/O card. |
| 4-4-2 | See 4-4-1, but this time is your Parallel port that's acting up. |
| 4-4-3 | You math coprocessor is having problems. Run a test program to double-check it. If it is indeed bad, disable it, or replace it. |
| Low 1-1-2 | Your motherboard is having problems |
| Low 1-1-3 | This is an Extended CMOS RAM problem, check your motherboard battery, and motherboard. |
BIOS "IBM"
| N° Beep | Descrizione dell'errore |
| 1 short beep | Normal POST - system is ok |
| 2 short beeps POST Error | error code shown on screen |
| No beep | Power supply or system board problem |
| Continuous beep | Power supply, system board, or keyboard problem |
| Repeating short beeps | Power supply or system board problem |
| 1 long, 1 short beep | System board problem |
| 1 long, 2 short beeps | Display adapter problem (MDA, CGA) |
| 1 long, 3 short beeps | Enhanced Graphics Adapter (EGA) |
| 3 long beeps | 3270 keyboard card |
BIOS "IBM Post Code"
Codici di diagnostica dei sistemi IBM (server e PC)
| Codice IBM (da-a) | Descrizione |
|
100 - 199 |
System Board |
| 200 - 299 | Memory |
| 300 - 399 | Keyboard |
| 400 - 499 | Monochrome Display |
| 500 - 599 | Color/Graphics Display |
| 600 - 699 | Floppy-disk drive and/or Adapter |
| 700 - 799 | Math Coprocessor |
| 900 - 999 | Parallel Printer Port |
| 1000 - 1099 | Alternate Printer Adapter |
| 1100 - 1299 | Asynchronous Communication Device, Adapter, or Port |
| 1300 - 1399 | Game Port |
| 1400 - 1499 | Color/Graphics Printer |
| 1500 - 1599 | Synchronous Communication Device, Adapter, or Port |
| 1700 - 1799 | Hard Drive and/or Adapter |
| 1800 - 1899 | Expansion Unit (XT) |
| 2000 - 2199 | Bisynchronous Communication Adapter |
| 2400 - 2599 | EGA system-board Video (MCA) |
| 3000 - 3199 | LAN Adapter |
| 4800 - 4999 | Internal Modem |
| 7000 - 7099 | Phoenix BIOS Chips |
| 7300 - 7399 | 3.5" Disk Drive |
| 8900 - 8999 | MIDI Adapter |
| 11200 - 11299 | SCSI Adapter |
| 21000 - 21099 | SCSI Fixed Disk and Controller |
| 21500 - 21599 | SCSI CD-ROM System |