Macintosh IIfx tries to start but won't catch

[plat]

I'm guessing this is a common problem as they age but I have had trouble describing the issue and finding information. Basically when you hit the power switch there is at least a click and sometimes it begins to power up to the point of starting the chime and then quits. It was working perfectly when last run probably 10 years ago. I have already replaced the pram batteries and re-seated everything including the memory chips and power supply connection to no effect.

I suspect bad capacitors at this point? If so, more likely on the motherboard or in the power supply? I just want to be cautious with it and not take the risk in doing anything unnecessary if I can avoid it.

I appreciate any thoughts on this.

 

[David Cook]

There are a couple of different versions with different quantities of electrolytic capacitors of the motherboard. Can you take pictures of the motherboard? (Particularly the right side --that's where the power on/off logic is located)