Why does the Imaq 22 inch model give out electric shocks

I had my IMAC computer on but wasn’t actually using at the time.

I reached over to get some papers on the desk to the left of the IMAC

As my hand passed close to the bottom part of the monitor, I received an electric shock. I did not realise what it was at the time. It was only when I passed my hand over the same spot after having retrieved my papers I received another electric shock.

I felt very disorientated afterwards and had to stop what I was doing. I experienced waves of pain and a throbbing sensation in my right hand. I had to take pain relief. The next day when I woke up the pain in my hand was excruciating and necessitated a trip to the doctors.

I had my sockets tested. It is appropriately earthed.

I checked with the electricity company for groundwork surges. There were none

My electricity usage was low on the day

I spoke to several engineers who confirmed that no software exists which can go back in time to find out what caused the shock.

Has this happened to anyone else.?