W520 beeps 4 times every two minutes

This morning I started up my computer from its sleeping mode, and it beeped four times. It keeps on happening consistently every two minutes.
Basically, it does this, within two seconds:
beepbeep...beepbeep...beepbeep...beepbeep
It is incredibly annoying, and searching on the Internet has proved fruitless. I am able to all functions normally, except listen to sound because it overlays any other sound. I don't know what it means. If anyone could help, it would be much appreciated.

TrimHopp,
Welcome to the Support Forums
What is your exact machine type of W520? what operating system it is running? The machine type can be found on a sticker on the bottom of the unit. Any recent changes to the computer?
When you boot into BIOS does the machine still make the beeping noise?
Thank you for being a part of the Lenovo Family,
Catie
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