recently, my powermac g5 has a problem. when I press button. the front panel led no light. but power still turn. I check information in the internet. maybe it is power supply problem. G5 series released in 2004-2005. if I use power pinout. can I solve this problem??? I heard this series power component has a little problem. can I replace with atx power? and now I bought a motherboard and cpu. original motherboard can't force shutdown if you press button. so I consider if want to buy power supply. so ask everyone. thanks.