The tower model G5s didn't have the same issues with the exploding capacitors, did it? If new RAM doesn't fix it, you might want to take a look at the caps, particularly those in the power supply regions of the logic board, and the power supply itself.

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My G5 motherboard has SMT capacitors that look exactly like the ones on older Mac motherboards which tend to leak after a while. I guess I've got another 10 years and then I'll have my G5 apart in pieces, replacing the capacitors xx(

The whole bulging capacitors thing isn't really Apple's fault. I think almost everyone was affected by that in some way.

Power supply issues in general - the power supplies are all made by third parties so you can pretty much blame those third parties. What didn't help though is when the PSU is in some funky proprietary shape (G4 MDD).