G4 just replaced power supply , it powers up , but the screen is not on and the mouse and keyboard aren't on either. A few times the computer came on with screen working but then it froze up, can't do any type of reset cause of keyboard not working. Help!

G4 just replaced power supply , it powers up , but the screen is not on and the mouse and keyboard aren't on either. A few times the computer came on with screen working but then it froze up, can't do any type of reset cause of keyboard not working. Help! Pressed pmu button already,  nothing ,..  Ppc g4 Mac

Should I check the memory cards themselves? Reseat them?
Yes.
Memtest X or Rember to test the RAM.
Reseat is also good.
The iPhone 4 doesn't like USB 1.1 much.
after the update the computer was working well, except for this freeze when ever I connect iPhone.
I'd try USB 2.0 PCI. That's how I connect my iPhone 4s, and have connected all iPhones and iPods, to my G4.
Never an issue.
Can't say the same for USB 1.1.......
The above (previous post) linked PCI card is cheap enough.
Want cheaper, try this:
http://www.amazon.com/Protronix®-5-Port-Controller-Card-Chipset/dp/B005JE2U82/re f=sr_1_2?ie=UTF8&qid=1337472141&sr=8-2
The NEC chipset is the desired chipset, regardless of what OS the maker says is compatible.
OS X has native NEC chipset USB support.

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