G4 won't power up when pressing front power button.

Hi all
I'm faced with another problem. I was trying to power up my other G4 500mhz( Blank internal hard drive) from a outside source OSX cd but it doesn't even power up at all. Shouldn't it power up even from a bootable OSX cd? Or with nothing at all? I should be able to hear the fan or something start up.
What can it be?
Thanks for your input

Hi
I noticed no battery on my AGP G4 tower so I took one from my other G4 (which is pretty dead) and put it in the AGP one.
Even though I still need a hard drive with a good OSX installed will it work if I don't follow the below steps? Or should I follow thru the steps any way?
Thanks for your help.
Resetting the PMU Chip Procedure
1. Disconnect the power cord and check the battery in the battery holder (BT1). The battery should read 3.3 V to 3.7 V. If the battery is bad, replace the battery, wait ten seconds, and then reset the PMU (refer to the next step). If the battery is good, go to the next step.
2. Press the PMU reset switch (S1) once on the logic board. Do not press the PMU reset switch a second time because it could stop the PMU chip from responding.
3. Wait ten seconds before connecting the power cord and turning the computer on. If the computer turns on, go to the next step. If the computer does not turn on, there is something else wrong with the computer.

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