My iMac will no always start only after a few push at the start button in the back then my iMac will start. I am worried this is happening, what is it?

My iMac will not always start after pressing the start button in the rear, sometimes I need to push 3 or 4 times for the pc to engage and start then will work fine up until next day when it may start properly or will need 3 or 4 pushes at the rear start button. Why is this happening? pls help!

I have the same issue  since long time now..it started since was new and i took it to one Apple repair service among other issues i had and they couldn't repair it. i finally im in progress now to find by my self what is happening..AC is never stable and power supplies have a tolerance to work inside this tolerance. And this is is their work too..to stable and convert ac to dc to make a pc work.so i dont think is something at your wall outlet..
unless you are using some kind of UPS..and dont fuctioning properly.. Start up button works for a moment giving a power commant to logic board  to open the power supply..in generally
If something not meet that never start up.. Among other issues that maybe from hard drive and many more if the power button is fail you will need a new housing.. Apple say that.
Any way i hope your problem fixed. Mine is on investigate..

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