Hi
Customer with ~4 year old Power Mac G5 2 x 2GHz / 2 x 512MB / 2 x 250GB / Leopard. Replaced original ( failing ) HDD with 250GB Seagate and upgraded from Tiger to Leopard within the past 6 months. Suddenly a few days ago it won't boot. Only thing right before this is he plugged in his digital camera and everything froze.

• Gets to grey screen with Apple logo without the spinning activity gear
• Takes ~10 seconds from power button press to show video ( this is likely the case before this boot issue but I can't recall )
• Only keyboard / mouse / video connected

• Ran Disk Utility using my MacBook via USB enclosure ( Passed )
• Ran DiskWarrior 4.1 using my MacBook vai USB enclosure
  • Minor Volume Information repaired
  • ~5 Airport Utility permissions repaired
  • ~2 Framework permissions repaired ( I forget what framework )
  • 1 corrupt preference ( com.apple.iphotomosaic.plist )
• Tried PRAM reset ( This makes it not show any video. Next attempt to boot normally results in no boot 'chime' and no video )
• Tried Open Firmware reset ( reset_nvram results in OK but than trying the reset-all command results in a freeze. Past experience with that command has the machine display the OK results for a moment and than automatically reboot )
• Tested PRAM battery voltage ( It's an analog display voltmeter but it looked like it tested at exactly 3.0v. Battery is suppose to be ~3.6v new. I don't have any other PRAM batteries to test right now. One is on order for another machine. )
• Reset PMU
• Tried different RAM
• Removed secondary HDD
• Disconnected optical drive
• Removed extra Apple Gigabit Ethernet Card ( PCI-X slot )
  • Coincidentally after putting it back in, tried booting once; grey Apple. Second try, now it says his RAM doesn't pass; power LED blinks 3 times. Also does this for the two 256MB sticks I tried earlier but two brand new 512MB sticks it works with. )

Last step is to try a clean install ( though I do want to try a new PRAM battery ) but I'm a bit skeptical considering this clean install was only ~6 months so ago but especially the issues with PRAM resetting. Does the reset-al command also try to reset PRAM? Anyone think / know this is a logic board or otherwise hardware failure? As an additional question now, did it fry all those sticks of RAM? I'll try them in another machine when I get a chance.