Mac Forum / General / Hardware / January 2005

Solved.
I dismantled the case, disconnected all the plugs inside the case, did
a reset  off the power management and put all together.
Turn the power on and the thing started up.  :)

This is an older iMac (I assume one of the teardrop shaped with CRT
single piece units). I never owned one or ever used one, but here are
some possible things to at least try (free at no cost).

Yes, it could be a hardware problem, but at least try these.

Try each one, one at a time.

1) make sure all power cords are correctly seated and Mac is getting
power. Unplug power cords and reseat.
2) Hold down COMMAND (flower shaped key) CONTROL keys and press Power
button.
3) Press and hold the power button for 5 seconds, release and then try
pressing it again to turn it on.
4) press the reset button (I believe in the recessed area on the side
right? where the USB & firewire connections are.
5) holding down COMMAND OPTION P & R keys on start up until you hear the
chime at least twice. This will reset the PRAM (parameter ram which
controls startup functions and time, key repeat settings etc).

On desktop Macs of later vintage there were also a battery on the
motherboard for power for Parameter RAM, and a motherboard hardware
reset called CUDA on older Macs and PMU on newer ones. Replacing the
battery and pressing this switch (either one) might bring back a desktop
which has your symptoms.  I don't know where the equivalent spots
buttons are on an older iMac. These items are located directly on the
motherboard on desktop later Macs.

Hope this helps and gets the iMac started. Wish I knew more about the
older iMac specifically to help you better.

G'Day
Morenuf