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 : keyboard card
The beeps are post during post the very first work is done by the RAM , all the memory in the RAM is first transferred to the hard disk,and remains active untill turned off. WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL. http://www.kitchentablecomputers.com/static.php - rules
Make sure that your RAM modules and Cmos battery are securely seated on some motherboards Cmos batteries are soldered in. Test all power and data leads that attach from Motherboard to your Hard Drive IDE SATA Make sure they have a secure dust free connections if its a flat 40 pin ide it will be the first to fail Check the graphics card is seated properly with no dust in the socket you might have to remove it to check for dust reinstall it. Restart your computer the found new hardware wizard should activate A computer needs power and data to travel through every working device and to its continue its cycle and to have and end to function. Make sure all leads that are attached to your drives dvd\cd and floppy drive have secure Make sure the connections and are not faulty or just replace them they could be faulty A computer needs all electric current and computer data to travel to and through every working device and have an end to work properly so any faulty leads will end up with a computer error. Also check the Keyboard for secure dust free connection ps2 and or usb. Click start control panel administrative tools computer management device manager scroll through devices if you see a yellow Question / Exclamation ? ! or a Red X a new driver will need to be installed / updated. Right click to update driver. If you computer came with a motherboard disk the drivers could be on it. Rather doing a driver hunt which can take hours http://download.cnet.com/slimdrivers-free/3000-18513_4-75279940.html
it might take some time being a freeware driver solution note: it will find all of your outdated drivers This is a free driver solutions.
This will automatically search for and find the correct driver you will have to update every driver individually once you update you might be asked whether you want to restart or make a system restore point.
Click no to both of these then continue updating each driver free then restart once all of the drivers have been updated.