|I agree fully with Richard59.|
The device I have pointed to provides a quick and convenient go/nogo check with all the qualifications that he has stated. Then again it is cheap.
I will also second his comment about emachines lack of use of good quality components.
Not to be alarmist but I have known emachines PSU failures that have also taken the motherboard with it.
☺ When everything else fails, read the instructions.