iMac G4 intermittently powers on

my imac g4 of sudden refuses start up. push power button, nothing. no fans, chime nada. reset pmu button, booted, next day same thing. took apart, checked ram, , replaced pram battery. powers 1 out of maybe 10 times, chimes screen stays black, every once , while makes way desktop, kps. haven't been able check log since won't put consistently @ all. chance power supply? or best bet logic board? thanks!

 

i'm going power supply dieing. i've had dell box me once. after month of turning on, got bright flash of blue light , dead power supply.

 

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