|I have an Apsire 1680 series - about 4-5yrs old... Occasionally it will not power up, unless I press and hold on on/off button for a second or two/three - rather than simply press it quickly...|
As you are already doing much the same... I'm inclined to feel there is sumat amiss inside the system...?
Are you still trying to power up via a mains conection; or just battery?
Can you get as far as the setup message to acess bios settings; or is there absolutely no sign/sound of life at all?