I have a strange noise coming from within my 2011 iMac Desktop.

I have a strange noise coming from within my 2011 iMac Desktop. This started 1 week ago and is intermittent. It sounds like an electronic drill. I have removed all external connections and powered up the Mac and just left it running. Some 2 hours later the noise started. On hitting the space bar on the keyboard the noise stopped. I did a similar test and the noise started within 2 minutes so I have discounted any overheating issues.
With keyboard activity there is an increase in the frequency of this fault.
If you open safari when the fault reappears the URL web link text starts flashing at the same frequency as the noise. This fault can appear with or without the noise.
I’ve been typing these details out on Word and as soon as I went to save the document the noise started and as soon as I hit the OK option in the save window the noise ceased.
Any thoughts will be appreciated.

I think this issue might be related to my wireless Keyboard. have just noticed that certain combinations of keys do not work. The Right hand shift + ? didn't work but started this noise. Hit another key and the noise stopped Also I have problems using the right hand shift key with the letters Y, H & N , they don't work and are all in line.
So I'm taking the keyboard back to John Lewis. it will be easier to carry that the screen !!

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I have a strange noise coming from within my 2011 iMac Desktop.

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