You’ll still have to press the Power On key on the keyboard to power up...(by the power of grayskull)..
The switch that looks like the power button just switches on the light...Doh!
Er, press
Command-Control-Power Key.
This will reboot the
computer.
to reset
1)Open the cover on the right side of the iMac and locate the reset hole between the Ethernet <…>and modem ports. It has a small triangle icon next to it (it’usually the top hole).
2)Carefully insert the end of a large, straightened paper clip into the hole and push gently on the button inside. Do not use excessive force. Your computer should restart.
3)If the reset button doesn’restart the iMac, unplug the computer, wait at least 30seconds, then reconnect the power plug and turn the computer back on in the normal way.
4)On a G3 blue/white,the reset button is on the front panel under the power button. The reset button has a triangle and is on the left.
5) don`t know
Good luck!