Every time the computer automatically runs diagnostic software POST (Power-On-Self-Test), which is “written” into the ROM BIOS.
POST checks all important computer components: monitors performance CPU, CMOS, supporting chips of the motherboard, and provides a quick memory test. Information on how to diagnosis your computer was issued for the PC speaker as a special signal.
If your computer is working fine, ie POST diagnostic program was successfully completed, you will hear one short beep, then begin loading the operating system on your computer.

If it finds a broken component of a computer the diagnostic program POST will give a special sound signal (a sequence of long and short beeps), which characterizes the detected errors, and the computer stops working.
If the computer has issued a sequence of short and long beeps and stops working, you want to count the number of these beeps for their subsequent analysis. You can turn off the computer, wait about 30 seconds and turn it on again. By counting beeps, find your combination of sounds in the table corresponding to your computer’s BIOS. The tables, which are listed on this page, you will find a transcript of sound signals. Thus, even without special diagnostic tools can pinpoint the problem of PC.

Table 1. The value of audio signals IBM BIOS
A type of audio signal a value of audio signal
One short Normal termination of POST, everything is OK
No signal power-generating unit is invalid
Continuous signal power-generating unit is invalid
Repeating short signals power-generating unit is invalid
1 long and 1 short motherboard is invalid
1 signal and a blank screen video system is invalid
1 long and 2 short video system is invalid (Mono / CGA)
1 long and 3 short video system is invalid (EGA / VGA)
2 short video system is invalid (monitor isn’t connected)
3 long motherboard is invalid (Keyboard controller error)

Table 2. The value of audio signals AWARD BIOS
A type of audio signal a value of audio signal
1 short Normal termination of POST, everything is OK
No signal power-generating unit is invalid
1 signal and a blank screen video system is invalid
1 long and 2 short video system is invalid
1 long and 3 short monitor isn’t connected
2 short any harmless error
3 long motherboard is invalid (Keyboard controller error)

Your computer can get into serious troubles if you do not pay attention to the regular update of the drivers. And this is where driver updater can save you much time.

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