end 2012 iMac 27-inch randomly turns off during simple tasks

HI I end 2012 27 inch I Mac

while I do tasks such as there is a time when I was waiting for a word on Microsoft word 2016 document while listening to a YouTube video, my Mac goes off randomly. If I move the mouse that nothing happens, or if I click on the keyboard, even when I click on the button at the back of the mac market. To remedy this, I have to cut the plug from the socket and wait a few minutes, then switch it on again, then without me touching the power button on the back of the Mac turns. I have a usb hub that has a constantly on the Mac is on the head, and when the problem arises that the led is not on so I'm sure that the Mac is turned off completely without power. The power offs get more frequent, and at first I thought it was because it was when I was using Windows in virtual box, but I deleted the virtual machine and the problem still happens.

I think it has something to do with the power supply becpause I have the iMac connected to an extension cord about 7 meters which is plugged into the wall outlet

the extension has only two taken end that which I use for the Mac and one for my printer (brother j132w) but I don't think that the printer has nothing to do with it, because the problem happens even just the I Mac is connected to the extension lead.

I live the. U.K., so I have the uk plug if it has a meaning

Help, please

Thank you

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Tags: Mac

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