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the green light flashing on the backside is your internetconnection. about the computer wan't start i should check the PSU do the fan movs any light on the motherboard.if not is the electric cord firmly and tight in place.if the fans runs and lights on the motherboard.you got no picture proberly brooken videocard.
An abnormally high amount of elecricity due to a nearby lightning strike may have entered your personal computer. However it sounds as if you might make sure there are no disks stuck in the drawers. Also open the case of the computer up and give it a nice cleaning with a can of compressed air. Just spray all the dust out. I am not saying you smoke, but if there is a smoker in the house who smokes around the computer this could also be the culprit. Or possibly a bad motherboard. I know you said you dont have a clue about motherboards but... Find the big green circuit board inside your computer with all the wires attached to it. You will see some little battery looking things sticking up off it. These are capcitors. Look at them closely, but dont touch anything and make sure the computer is unplugged. When you are looking, you want to check for any brown stains on the capacitors or any swollen capacitors. If you see this, you probably need a new motherboard.
If you are sure that the 110 volt power is coming into the computer then the most likely problem is that th epower supply died. Obtain a new one of the same or larger wattagge as the one you are replacing . It does nto have to come from the manufacture of the computer.
sounds like something is drawing down on your 12 volt supply drives or on board regulators. Try it without the drives connectged, and see if you can get the system to boot up(you'll just get a notice that your drives are unavailable, but you'll already know that, right?