Is it short or long beeps?
2 short beeps
Floppy diskette or compact disc not detected
1 short beep and 1 long beep
Memory problem
Resolving beep codes
Perform the following steps to resolve beeping issues. Before starting a task, turn off the computer, and then remove the power cord. After completing a task, replace any covers, reconnect the power cord, turn on the computer, and then listen for a beep code.
Remove any media from the floppy drives, CD/DVD drives, USB ports, and memory card reader slots, and disconnect all non-essential devices (printers, scanners, external hard drives, and similar).
Disconnect the mouse and keyboard, and then restart the computer. If the beeping sound stops, repair or replace those devices.
Hot air can damage internal components! Remove any obstructions that block vents. Clean the cooling vents on the case to remove dust. If cooling fans stop spinning or make strange noises, service the computer.
Remove the memory cover, and then reseat all memory modules. If the computer stops beeping, a memory module might not have been fully seated or connected.
If the computer has multiple memory modules, turn on the computer with only one memory module installed. If the computer stops beeping, the memory module might be defective, or might be the wrong type of memory for the motherboard. Reinsert the memory into the socket to see if a connection was the problem; otherwise replace the module. Repeat this process for all memory modules installed in the computer.