Gsync not working properly

[LOWtempsPLZ]

Hello

 

Games work fine if I disable gsync in nvidia control panel. But with gsync turned on my gpu seems to be fine but my monitor keeps turning off and on while playing games. I have moved from another place where my monitor and psu cable weren't plugged into the same extension cord (where gsync was not a problem) to a place where my monitor and psu are plugged into the same extension cord; could this be the issue? 

 

Thanks