What components are required for power mac G4 to boot

Hi, I recently pulled out my dad’s power Mac G4 quicksilver and I tried to plug it in and boot it up but it didn’t turn on. He said he took some components out. I only know he took out the hard drive and the pram batteries but the others, I don’t know. That’s why I was asking what specific components are required for my model to boot up.
 
It looks like the hard drive is missing and a fan is dangling. All of mine work fine with no battery, but the time/date will reset if unplugged from the wall.

If it won't power on, it could be the power supply going bad. You could try leaving it plugged in for a while and see what that does. Re-capping usually fixes them unless it was hit by lightning or something. You could also clean and re-seat the various connectors, etc.
 
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