Most modern computers are programmed to beep and shut off if they detect an internal problem. The pattern of these beeps is known as a beep code, with each code corresponding to a specific part of the computer that could be malfunctioning. Below are some tips to diagnose and fix the most common problems.
First, write down your computer’s specific beep code. Pay careful attention to the pattern and speed of beeps, as small variations can correspond to very different problems. Next, check the codes for your computer manufacturer. You can find most codes either online, or with your computer’s original paperwork.
If you are unable to find your codes using the above methods, you can research more comprehensive information by discovering your computer’s motherboard BIOS manufacturer. Fortunately, finding this information is as easy as looking at your computer’s startup screen. If the information isn’t displayed, take your computer to a professional for more extensive troubleshooting.
Cause: Loose or Dusty Components
After discovering the meaning of your beep code, the next step is checking your computer for any obvious problems. The majority of beep codes are for minor issues, such as dirty or loose components. First, unplug and open your tower and gently clean all surfaces with a dry cloth. Next, make sure all wires and other components are secure. Finally, close your tower and turn on the power. If the beep codes continue, consider taking your computer to a shop in for more advanced repairs.
Cause: Malfunctioning Fan
Computer fans are designed to circulate air in order to keep internal components from overheating. However, dust and debris often prevent a fan from running smoothly. If your fan malfunctions, carefully clean it out with a dry cloth. Next, turn on your CPU. If your fan fails to start, it will need to be replaced.
Cause: Damaged Components
Corrupted or damaged video cards, RAM sticks, and hard drives can cause beep codes. The amount of skill needed for repairs varies, from simply replacing video cards to repairing and troubleshooting a hard drive. If you believe your computer is malfunctioning due to damaged components, consider sending it to a repair shop; attempting to fix the damage without proper knowledge could lead to more extensive repairs.
Source: Lance has encountered this problem in the past, and corrected it himself.
Source: http://pcsupport.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=pcsupport&cdn=compute&tm=448&f=20&su=p504.6.342.ip_&tt=7&bt=1&bts=1&zu=http%3A//www.informit.com/articles/article.aspx%3Fp%3D27188%26seqNum%3D11, August, 2012