|"I found a solution to unplug, press start button to drain and then plug back in"|
That is not something that normally has to be done so you didn't actually fix the problem, all you did was find a temporary work-around. More than likely your power supply has failed. That's fairly common for Gateway/eMachines systems due to the poor quality Bestec power supplies that are used. If you want advice or suggestions for a replacement, we'd need to know the exact model/model number of your Gateway.