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cowboyonamac
11-15-2008, 06:10 PM
I have 10.5.5 on one half of the drive and 10.4.11 on the other half. Leopard runs fine, but a little slow on startup. And a flash drive gives me kernel panic problems from time to time, but I think it's because I use it with the laptop too and that's Vista:weeskull:

Yesterday I was at dad's rebuilding his PC, and when I came home, the iMac was off. I thought this was odd because I put it to sleep before I left.

The problem returned a couple hours ago while making some new icons in Photoshop. As I was resizing an image, "pop" and I'm staring at a black screen. No kernel panic, no warning, nothing. Just "pop" and it shut off.

I gave it about ten minutes and restarted. Everything was OK, but about five minutes into photoshopping again, suddenly the window pops up telling me that OS X was restarted after it quit unexpectedly. I kept working for an hour or so, and suddenly "pop" it went black again.

Does this sound like software or hardware?

I had one of the powerdown converters that was replaced under the recall last summer, and since the HD, Ram and OS are only about six weeks old, I have to think this is something I didn't replace in September.

One thing I haven't done yet is run AppleJack, but if it's hardware, that won't really help, which is why I haven't done it yet.

Strange thing in all of this is the temps are only about 140-145 degrees, and fans are not really ramping up, so it doesn't appear that the unit is running hot. It just shuts down.

M.Brane
11-15-2008, 08:05 PM
Hmmmm. Perhaps a known issue? (http://www.apple.com/support/exchange_repair/imac.html)

cowboyonamac
11-15-2008, 08:20 PM
"I had one of the powerdown converters that was replaced under the recall last summer."

It was only doing it in 10.4.11, and I got a crash log:

Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000000000010 PC=0x0000000045BC3C9C
Latest crash info for cpu 0:
Exception state (sv=0x45350280)
PC=0x45BC3C9C; MSR=0x00009030; DAR=0x00000010; DSISR=0x40000000; LR=0x45BC3C98; R1=0x2CA6B7C0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x45BC3C98 0x45BC3C34 0x002D2244 0x45BC4298 0x45BC4104 0x004C49E8
0x00B692DC 0x00B6AE3C 0x00B6B138 0x00B6B248 0x004C48A0 0x00B692DC 0x00B699A8 0x00B69A40
0x00B6483C 0x002D1B8C 0x002D0A54 0x000A9714
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOUSBMassStorageClass(1.4.5)@0x45b c1000
dependency: com.apple.iokit.IOUSBFamily(2.8.1)@0x4c2000
dependency: com.apple.iokit.IOSCSIArchitectureModelFamily(1.4. 9)@0x464000
dependency: com.apple.iokit.IOStorageFamily(1.5)@0x43d000
com.apple.driver.AppleUSBEHCI(2.5.9)@0xb60000
dependency: com.apple.iokit.IOUSBFamily(2.8.1)@0x4c2000
dependency: com.apple.iokit.IOPCIFamily(1.7)@0x4ec000
com.apple.iokit.IOUSBFamily(2.8.1)@0x4c2000
Proceeding back via exception chain:
Exception state (sv=0x45350280)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x3CA2F780)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

Kernel version:
Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x000954F8 0x00095A10 0x00026898 0x000A8204 0x000ABB80
Proceeding back via exception chain:
Exception state (sv=0x45350280)
PC=0x45BC3C9C; MSR=0x00009030; DAR=0x00000010; DSISR=0x40000000; LR=0x45BC3C98; R1=0x2CA6B7C0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x45BC3C98 0x45BC3C34 0x002D2244 0x45BC4298 0x45BC4104 0x004C49E8
0x00B692DC 0x00B6AE3C 0x00B6B138 0x00B6B248 0x004C48A0 0x00B692DC 0x00B699A8 0x00B69A40
0x00B6483C 0x002D1B8C 0x002D0A54 0x000A9714
Kernel loadable modules in backtrace (with dependencies):
com.apple.iokit.IOUSBMassStorageClass(1.4.5)@0x45b c1000
dependency: com.apple.iokit.IOUSBFamily(2.8.1)@0Model: PowerMac8,1, BootROM 5.2.2f4, 1 processors, PowerPC G5 (3.0), 1.8 GHz, 2 GB
Graphics: GeForce FX 5200, GeForce FX 5200, AGP, 64 MB
Memory Module: DIMM0/J4000, 1 GB, DDR SDRAM, PC3200U-30330
Memory Module: DIMM1/J4001, 1 GB, DDR SDRAM, PC3200U-30330
Modem: Jump, V.92, Version 1.0
Serial ATA Device: ST3500320AS, 465.76 GB
Parallel ATA Device: MATSHITADVD-RAM UJ-875S
USB Device: USB Receiver, Logitech, Up to 1.5 Mb/sec, 500 mA
FireWire Device: LaCie d2 Extreme LUN 0, LaCie Group SA, Up to 400 Mb/sec
FireWire Device: IOMEGA MINIMAX Device 1, IOMEGA, Up to 400 Mb/sec

There are several references to a USB mass storage device, but the only one I have (SanDisk 8 Gb) wasn't hooked up when this crash log was generated.

Since it doesn't do it in Leopard, I have to think it's a problem somewhere in the Tiger side. I'm doing and archived reinstall to see. If it still does it, I'll scrub the partition and start fresh.

...and it just crashed during the install. I guess I'll 'gut' this thing, and start saving for an intel.

cowboyonamac
11-15-2008, 10:19 PM
So I took it apart, and when I got the logic board out, it's all black around the processor. And the fins in the cooling duct were absolutely full of lint and dust. I'm talking way inside where even canned air couldn't blow it out. I took the metal cover off, and the top of the G5 was scorched something fierce, and there was a bunch of dust burnt to the top of it. I had to use a razor blade to scrape it off.

So I have a Dual-layer Superdrive going into the Macmini, and 2Gb of RAM along with a 500Gb SATA hard drive going into my daughter's e-machine.
A power supply, ATi Radeon video adapter, and 20" display will all be donated to the local Apple shop (The Apple Store already said they won't take used parts, but the other shop does).

From what I've read of late, three years is about the life expectancy for a G5 iMac.

It'll be nice to get an Intel.

M.Brane
11-15-2008, 10:36 PM
I just blew the dust out of my tower today. I wasn't that bad, but I try to do it at least once a month. I think it had been a couple this time. Been busy.

Dirt kills. A clean machine is a happy machine.

I've never bought a can of compressed air. I have a compressor in the garage.

unclemac
11-16-2008, 11:34 AM
Good idea. Nothing to lose here. Read somewhere.....a similar fix with a G5 imac. Give it a shot.

Bad pun. :)

If that doesn't help...... I would consider retiring the G5 too. It sucks, but IMHO cramming the G5 in that case was a mistake in retrospect. The intel based Imacs seem to run much cooler, much quieter. Not nearly so many issues, and should have a much longer life, at least with regard to heat issues.

Pretty much every G5 imac I have run across (about a half dozen) have had some hardware problem.