I have conducted a pinout test and all seems ok... but..

Hi, I have conducted a pinout test on the power supply of my G4 Dual 500mz (100mz bus) (I think its a Giga ethernet) and it passed all stages, I have checked the battery and reset the pram, I have a steady red LED on the motherboard. When I press the start up button it only illuminates for one or two seconds, then nothing... the LED on the motherboard stays on and all the fans spin... but the front button stays dark and machine will not boot.
I have pulled and swapped the RAM (2x512 1x256 1x128) to no avail.
I have only just got the machine and when it refused to boot I removed the battery for an hour and started the machine up without it and it came on and booted but about 5 minutes into usage it froze, I pushed the reset button and now cannot get any response at all.
I used a battery from my other mac which I know works.. still no joy.
Can anybody let me know what I might do next?
I cant boot from a disc as the machine doesnt get past lighring up.. no chime.. nothing.
Help.... please

Thank you for your reply Forrest, If I might ask for some points of clarification please
(a) How do I make the malfunctioning machine a target disc? especially as it wont even get to the chime stage in boot up?
(b) Does it matter that the dud doesnt boot?
(c) How do I conduct this procedure?
(d) I have a dual 450mz processor that I pulled from my working G-E, should I try and fit these, are they suitable?
Thanks for your help.

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