Recently upgraded G4 MDD now chimes and starts but then shuts down, no vide

Hello all and thank you in advance for checking my question. I hope this particular question has not been brought up in the forums recently and if so, I am sorry for the duplication.
I recently received a G4 MDD FW800 with a single CPU running at 1.0 GHz with a broken motherboard but was assured that all else was working. I replaced the motherboard with a another motherboard, this one running at 167 MHz bus (as opposed to 133 MHz) which was equipped with a dual 1.42 GHz CPU.
The mac starts up, the power light illuminates, and the chime sounds, but no video appears and the machine shuts itself off in about 20 or so seconds. The machine is somewhat old and I am not sure if the PRAM battery is dead or if the power supply can't handle the dual CPU load. So I am stuck with a dead mac and I am looking for any hints as to how to go about diagnosing the problem.
The presence of the chime at least suggests that the motherboard is getting power, and that the RAM and CPU are OK, but I am not sure. Again, any help would be most appreciated, thanks in advance.

Hey everybody!
Well, I found the problem, at least I think I have...
I replaced the battery with a new one and at the same time I removed the heat sink and the processor daughter card and verified placement. After these two interventions, the mac starts like normal, whew, I am glad that is over Thanks to Allan for his quick and insightful reply.

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