If so, order yourself a replacement part of that Power Supply Unit(PSU). I think it is a faulty one. Get yourself a PowerBar for the machine. Sometimes, PowerBars do regulate the electricity flow that goes to all units plugged onto it.
If not, might as well get your machine upgraded as of the size of wattage of that PSU for a much bigger one, while having to buy a replacement one, anyway. Later on, you will not regret doing such upgrade as you, suddenly, decided to install a much better Video/Graphics card in the PCI-E x16's expansion slot.
Hope that enlightens you on your current situation.
My Acer Aspire 4730 is on outlet power and, for seemingly no reason, the light surrounding the power button changes colors from green to orange, to yellow and then keeps switching between orange and yellow. It stops if I pull the power cord out and then slip it back in, but I'm a bit worried about the computer.