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Source: Intel
Many guys who have problems with intel mobos may find it useful.

You are getting 1, 2, or 3 beeps that indicate a memory failure.

1 beep - Refresh Error (with nothing on the screen and it is not a video problem)

2 beeps - Parity Error

3 beeps - Base 64 K memory failure

• Reseat the memory.
• Make sure that the contacts on the memory and the socket are clean.
• Try removing one bank of memory modules at a time. Note: Some systems might need to have a memory module in Bank 0.
• Try using RAM chips from the same manufacturer with the same part number and speed.
• Check for a faulty memory module by trying the memory in a known good system.
• Trying known good memory in the system.
• Check the power supply and check for power fluctuations.
• Swap the motherboard.

You are getting 4 beeps indicating a timer not operational:

• Check for foreign objects such as screws that may ground the motherboard and make sure that screws that hold the motherboard are not too tight.
• Swap the motherboard.

You are getting 5 beeps indicating a processor error:

• Check for foreign objects such as screws that may ground the motherboard and make sure the screws that hold the motherboard are not too tight.
• Make sure the processor is seated properly.
• Swap the processor.
• Remove the motherboard and reinstall it.
• If the problem still persists, swap the motherboard.

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You are getting 6 beeps indicating 8042 - gate A20 failure:

• Check for foreign objects such as screws that may ground the motherboard and make sure the screws that hold the motherboard are not too tight.
  

• Try reseating the keyboard controller chip (if possible).

• Swap the keyboard.
• Swap the processor.

You are getting 7 beeps indicating processor exception interrupt error

• Make sure the processor is seated properly.

• Swap the processor.
• Swap the motherboard.

You are getting 8 beeps indicating display memory read/write failure.

• Make sure that you have a video card on your system.
• If possible, swap the memory on the video card.
• Swap the video card.
• Swap the motherboard.

You are getting 9 beeps indicating ROM checksum error.

• If possible, try reseating the System ROM BIOS chip.

• If possible, try reflashing the system ROM BIOS.
• Swap the motherboard.

You are getting 10 beeps indicating CMOS shutdown register read/write error.

• Swap the motherboard

You are getting 11 beeps indicating cache memory bad.

• Make sure the system is configured properly (CMOS Setup Program and jumpers on the motherboard) for the RAM cache.
• If possible, replace the RAM cache.
• Swap the processor
• Swap the motherboard

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