I have an obviously older Vaio pcg-fx140, that has been running fine for years. Lately when I try to power it up using the green power swith on the top cover, the three lights on that cover will flash and nothing else will happen. The battery is in poor condition, but able to hold a charge for a while. When I try to start the computer using only battery power, the result is the same, the three light will flash, but it will not power up. I have checked the AC power supply, and it appears to be fine and delivering the correct voltage. I'm stumped. Could the on - off button be at fault, or could it be the switch itself under that cover?? Any help would be greatly appreciated.