[Tyler McAdams]

For some reason when I it the main power button on my G4 the fan starts up and a red light turns on on the logic board but the system does not chime and the hard drive do not power up... any ideas what is going on?

[sek929]

Sounds like you need to hit the PMU reset button, something I had to do with my G4 after a power outage.



Sorry about the smallish image, but you can see the PMU reset at the bottom left of this picture.

[sek929]

You might also want to pick up a new PRAM battery, picture in the bottom right of previous jpeg.

It's a 3.6 volt 1/2 AA battery. You can get it just about everywhere that sells a variety of batteries.

[IceEnclosure]

When resetting the PMU after a power outage or something similar, I never experienced the fans starting up on boot (before pressing the PMU button as a fix). It just did nothing.

Originally Posted by Tyler McAdams 

For some reason when I it the main power button on my G4 the fan starts up and..

Originally Posted by sek929 

Sounds like you need to hit the PMU reset button, something I had to do with my G4 after a power outage.