BIOS error signals

During inclusion of a computer the sound signal is always audible, but sometimes it is more, than a lonely signal. You what is it? Ask, and the answer will be not pleasant - there was a problem with hardware. This signal publishes BIOS, and values of signals are resulted in tables below:

AMI

Signals	Problem
- *	Power Supply is out of order
2 short	Clock memory error
3 short	Error in first 64kb of memory
4 short	System timer error
5 short	CPU is out of order
6 short	Keyboard controller is out of order
7 short	Motherboard is out of order
8 short	VGA card is out of order
9 short	Test BIOS error
10 short	Can not write to CMOS
11 short	Motherboard cache memory is out of order
1 long + 2 short	VGA card is out of order
1 long + 3 short	Same
1 long + 8 short	The monitor is not connected.

AWARD

Signals	Problem
2 short	little errors**
3 short	Keyboard conroller error
1 long +1 short	Memory error
1 long + 2 short	VGA card is out of order
1 long + 3 short	Keyboard initialization  error
1 long + 9 short	Read error from ROM
short, recurrent	Power Suplly is out of order
long, recurrent	Memory problem
continual	Power Suplly is out of order

* - a absence of any signal.

** - Problem in CMOS Setup or motherboard.