I've got an iMac G5 here in the office with a few problems 
The board was replaced under the repair program a few years ago, but the power supply died after the program ended. I bought a new power supply.
When you boot the iMac G5, and only on a stone-cold boot (where the iMac is physically cold), the chime will play, but it will be interspersed with these strange screeching sounds. If the chime is 3 seconds long then I would say half of each second is screeching. I will post a recording once the iMac gets cold again.
Sometimes during this cold boot, it will kernel panic in the AirPort driver, but subsequent boots are OK.
I have ruled out almost every component except for the logic board. I even hooked up a speaker out of an old Power Mac 8100. The following items are definitely ruled out:
- Memory (tried several different sticks)
- PSU
- HD (two different HDs)
- Optical (unplugged it)
- Speakers
- Fans (unplugged them one by one while rebooting)
- AirPort (tried two different cards, and no card)
- Battery (reads 3.06V)
There appears to be no visibly leaking caps on the board, although some of them are the "+" topped brown caps which are the same kind that tend to leak.
I have been looping a 720p HD video on the iMac, and twice now the video randomly stopped playing and VLC froze up. I will try looping it in QuickTime in case VLC is just buggy.
Any advice would be welcome. The only option I see at this point is replacing all of the suspect "+" topped brown caps.
_________________
Stop being so Complicated. Take a RISC.
http://www.adoptamac.com
The board was replaced under the repair program a few years ago, but the power supply died after the program ended. I bought a new power supply.
When you boot the iMac G5, and only on a stone-cold boot (where the iMac is physically cold), the chime will play, but it will be interspersed with these strange screeching sounds. If the chime is 3 seconds long then I would say half of each second is screeching. I will post a recording once the iMac gets cold again.
Sometimes during this cold boot, it will kernel panic in the AirPort driver, but subsequent boots are OK.
I have ruled out almost every component except for the logic board. I even hooked up a speaker out of an old Power Mac 8100. The following items are definitely ruled out:
- Memory (tried several different sticks)
- PSU
- HD (two different HDs)
- Optical (unplugged it)
- Speakers
- Fans (unplugged them one by one while rebooting)
- AirPort (tried two different cards, and no card)
- Battery (reads 3.06V)
There appears to be no visibly leaking caps on the board, although some of them are the "+" topped brown caps which are the same kind that tend to leak.
I have been looping a 720p HD video on the iMac, and twice now the video randomly stopped playing and VLC froze up. I will try looping it in QuickTime in case VLC is just buggy.
Any advice would be welcome. The only option I see at this point is replacing all of the suspect "+" topped brown caps.
_________________
Stop being so Complicated. Take a RISC.
http://www.adoptamac.com