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Computer Beeps 3 Times on Startup

Last Reviewed: 02-Dec-2016
Article ID: 000005765

When you turn on your computer and it continually beeps 3 times (3 one-second beeps), it means there is a memory issue.

To resolve this problem, check the following:

  • Make sure the memory modules are properly installed in the DIMM slots and that they are pressed in completely, with the latches locked in place.
  • Make sure you use supported memory for your board. Check the speed and size of your memory.
  • Check that the memory modules are not defective:
    • Test the memory modules one at a time.
    • Try the modules in another computer, or try different known-working modules in this system.

This article applies to: