Mac Mini emitting beep-like noises while switched on

Hi all,
I have a late 2011 Mac Mini which has been working fine until today.
Today, it started emitting really annoying beep like noises while switched on. The Mac Mini functions as usual, safe for the really loud, really annoying beeping noises, which seem pretty much to occur randomly, and sound pretty random too (as opposed to steady system warning beeps).
I also opened the Mac-Mini hatch, checked the RAM was connected properly, and removed dust/fluff, but the beeping still happens.
I ran the Apple Diagnostic and also checked the Disk using disk utility, but got no errors, and I can't seem to find anyone who has had a similar issue on the net.
Any ideas?
Thanks in advance!

Google -- Mac Mini blinks and beeps
when turned on
It will take you to where you need to go to solve this problem.
Mine did that and it took me to Apple Support page identifying what was going on.
Slow blinks, fast blinks, etc etc
Power On Self-Test Beep Definition - Part 2 - Apple Support

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