Computer Error Beep codes

Note:The contents below are not my discovery but taking out from different sources.

When your is computer making some funny sound via the system speaker, it's not doing it because it wants to be heard. The computer is trying to tell you what's wrong.

Beep Code:	Description of Problem:
No Beeps	Short, No power, Bad CPU/MB, Loose Peripherals
One Beep	Everything is normal and Computer POSTed fine
Two Beeps	POST/CMOS Error
One Long Beep, One Short Beep	Motherboard Problem
One Long Beep, Two Short Beeps	Video Problem
One Long Beep, Three Short Beeps	Video Problem
Three Long Beeps	Keyboard Error
Repeated Long Beeps	Memory Error
Continuous Hi-Lo Beeps	CPU Overheating

So as you can see, if your computer doesn't start up and starts beeping away like a mime you can start the process of figuring out what is wrong by stopping for a second and listening. From a single beep which tells you everything is okay, to three long beeps which indicate a keyboard error to the sirCen like Hi-Lo beeps that tell you the PU is overheating - listening to your computer is good!