G3 imac DV SE power up problem

I've run out of ideas on this one, so any help or suggestions are greatly appreciated.
I have an intermittent power up fault with an imac dv 400Mhz 512Mb RAM.
On powering up via the keyboard or the main front button the power light comes on and stays green but no screen or hard drive noise goes along with it, pulling out the mains and reconnecting usually but not always allows the machine to boot and when it does manage to start up zapping the PRAM causes the machine to shut down.
When trying to install Panther from MacOS 9.2.2 the machine attempts to restart but shuts down and can't be started without difficulty.
The original battery that came out was completely dead and has been replaced with a used one that has good voltage.
The only other thing that sometimes makes a difference is disconneting the keyboard and powering up from the main switch.
I have reset the PMU, and upgraded the firmware and checked the logic board voltages J9,C10 and the J7 pins and all seem very close to the required outputs (how close do they need to be?) the only thing I haven't checked yet is the F901 fuse.
Is it likely that the PAV board is kaputt? or that the keyboard is causing the problems?
I'd really like to try and get this running as I use an identical machine upgraded with a 120Gb disc and 1Gb RAM running Tiger at my workplace that runs beautifully so I think it is worth trying to fix.
Or shall I give up on it?
G3 Imac DV SE   Mac OS X (10.3.4)  

If it consistently works with the keyboard detached, I'd switch keyboards with that other iMac to see if that's the cause. I would also buy a "new" battery instead of trying to re-use a used one. Another good test is to try it with one 256MB module at a time, to see of if one of them is faulty. Sometimes, RAM modules that worked fine with Mac OS 9 do not work with Mac OS X.

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