PowerMac G4 867Mhz (2001) boots into OPEN FIRMWARE

Hello;

I'm hoping someone might be able to point me in the right direction as to what to do next.

I have a PowerMac G4 867Mhz (2001).

I thought the power supply had failed and was looking at converting an ATX power supply.

By chance I discovered that if I disconnect/unplug the power-on board (820-1284-A) (FCT2) and then reconnect it the G4 would power on.

The LED would come on, and then blink 3 times.

So I worked through that until the bad RAM was removed. One of the slots may have failed as well.

The Power-On button however does not work when pressed. (I'll deal with that later).

The G4 only powers on when I do the disconnect/reconnect procedure.

Long story short, I can get the G4 to power on and it starts to boot up but goes to the OPEN FIRMWARE and stops.

I did much reading and found the command - "MULTI-BOOT" - which brings up a list of bootable disc's.

I booted the G4 into 10.5.8 and it started up and began working properly. So far so good.

I'm off loading some old files just in case so I don't lose them.

What I'd really like to know is - why is the boot up sequence going to OPEN FIRMWARE and stopping there - and is there a way to fix it. I'm assuming something is broken.

Many thanks in advance if anyone can offer some advice on how to fix the problem.

Jay.