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iMac G5 with narcolepsy

Message #1 - Posted 2006/02/23 - DrewM

We've got a 17inch iMac G5 at work that keeps falling asleep in the afternoons. No, really.

Symptoms are that it's making a wind noise like a gas turbine engine and then will spontaneously sleep itself mid-use. Waking it up again, it will usually immediate go back to bed.

All in all it's not dissimilar from myself.

Sounds like there's some sort of hardware fault (perhaps heat? cpu fan?) and it's going into self-preservation mode. Is this something anyone else here has seen?

drew.

Message #2 - Posted 2006/02/23 - Coda

DrewM wrote:

We've got a 17inch iMac G5 at work that keeps falling asleep in the afternoons. No, really.

Symptoms are that it's making a wind noise like a gas turbine engine and then will spontaneously sleep itself mid-use. Waking it up again, it will usually immediate go back to bed.

All in all it's not dissimilar from myself.

Sounds like there's some sort of hardware fault (perhaps heat? cpu fan?) and it's going into self-preservation mode. Is this something anyone else here has seen?

I'm not an apple engineer (no kidding ;-)) but I would not switch it on again until you have found and fixed the cause of the problem. It sounds like the CPU is overheating. Start by opening it up. Have a good look around the heatsink/CPU area to make sure they are still 'friends'.

Message #3 - Posted 2006/02/23 - Mike Jenkins

DrewM wrote:

We've got a 17inch iMac G5 at work that keeps falling asleep in the afternoons. No, really.

Symptoms are that it's making a wind noise like a gas turbine engine and then will spontaneously sleep itself mid-use. Waking it up again, it will usually immediate go back to bed.

All in all it's not dissimilar from myself.

Sounds like there's some sort of hardware fault (perhaps heat? cpu fan?) and it's going into self-preservation mode. Is this something anyone else here has seen?

Sounds like it's overheating - check Console (in Applications>Utilities) and look for "Thermal Overrun" events. If this is happening, call Apple.

Mike Jenkins
Dreamcast / Gamecube FAQs - http://www.kwik-e-mart.org Mike's Auctions: http://tinyurl.com/93qtw 360 Gamertag: LilWashu360

Message #4 - Posted 2006/02/24 - DrewM

Mike Jenkins wrote:

DrewM wrote:

We've got a 17inch iMac G5 at work that keeps falling asleep in the afternoons. No, really.

Symptoms are that it's making a wind noise like a gas turbine engine and then will spontaneously sleep itself mid-use. Waking it up again, it will usually immediate go back to bed.

All in all it's not dissimilar from myself.

Sounds like there's some sort of hardware fault (perhaps heat? cpu fan?) and it's going into self-preservation mode. Is this something anyone else here has seen?

Sounds like it's overheating - check Console (in Applications>Utilities) and look for "Thermal Overrun" events. If this is happening, call Apple.

Yes, I think you're right. The system.log is full of these:

kernel[0]: ---------------------------------
kernel[0]: Thermal Manager: max temperature exceeded for 30 seconds, forcing system sleep
configd[29]: AppleTalk shutdown
kernel[0]: SMU_Neo2_PlatformPlugin core dump:
kernel[0]: IOHWControls:
kernel[0]: [0] "System" Type:"fan-rpm" Id:0 TGT:3207 CUR:0 kernel[0]: [1] "Hard Drive" Type:"fan-rpm" Id:2 TGT:2500 CUR:2497 kernel[0]: [2] "CPU" Type:"fan-rpm" Id:1 TGT:5600 CUR:5593 kernel[0]: [3] "sysclk slew" Type:"slew" Id:100 TGT:0 CUR:0 kernel[0]: IOHWSensors:
kernel[0]: [0] "CPU Power" Type:"power" Id:5 CUR:7.22614 W kernel[0]: [1] "CPU Voltage" Type:"voltage" Id:2 CUR:11.59584 V kernel[0]: [2] "CPU T-Diode" Type:"temp" Id:0 CUR:86.36476 C kernel[0]: [3] "Hard drive" Type:"temperature" Id:4 CUR:49.0 C kernel[0]: [4] "CPU Current" Type:"current" Id:1 CUR:0.53760 A kernel[0]: IOHWCtrlLoops:
kernel[0]: [0] "Clock Slew" Id:0 MetaState:0 "Dynamic Power Step" kernel[0]: [1] "PowerMac8,1 A System Fans" Id:1 MetaState:0 "Normal" kernel[0]: [2] "CPU Fan" Id:2 MetaState:0 kernel[0]: ---------------------------------

Message #5 - Posted 2006/02/24 - Chris Ridd

On 24/2/06 10:50, in article z7SdneV8eruSeGPeRVnysQ@pipex.net, DrewM wrote:

Mike Jenkins wrote:

DrewM wrote:

We've got a 17inch iMac G5 at work that keeps falling asleep in the afternoons. No, really.

Symptoms are that it's making a wind noise like a gas turbine engine and then will spontaneously sleep itself mid-use. Waking it up again, it will usually immediate go back to bed.

All in all it's not dissimilar from myself.

Sounds like there's some sort of hardware fault (perhaps heat? cpu fan?) and it's going into self-preservation mode. Is this something anyone else here has seen?

Sounds like it's overheating - check Console (in Applications>Utilities) and look for "Thermal Overrun" events. If this is happening, call Apple.

Yes, I think you're right. The system.log is full of these:

kernel[0]: ---------------------------------
kernel[0]: Thermal Manager: max temperature exceeded for 30 seconds, forcing system sleep
configd[29]: AppleTalk shutdown
kernel[0]: SMU_Neo2_PlatformPlugin core dump:
kernel[0]: IOHWControls:
kernel[0]: [0] "System" Type:"fan-rpm" Id:0 TGT:3207 CUR:0 kernel[0]: [1] "Hard Drive" Type:"fan-rpm" Id:2 TGT:2500 CUR:2497 kernel[0]: [2] "CPU" Type:"fan-rpm" Id:1 TGT:5600 CUR:5593 kernel[0]: [3] "sysclk slew" Type:"slew" Id:100 TGT:0 CUR:0 kernel[0]: IOHWSensors:
kernel[0]: [0] "CPU Power" Type:"power" Id:5 CUR:7.22614 W kernel[0]: [1] "CPU Voltage" Type:"voltage" Id:2 CUR:11.59584 V kernel[0]: [2] "CPU T-Diode" Type:"temp" Id:0 CUR:86.36476 C kernel[0]: [3] "Hard drive" Type:"temperature" Id:4 CUR:49.0 C kernel[0]: [4] "CPU Current" Type:"current" Id:1 CUR:0.53760 A kernel[0]: IOHWCtrlLoops:
kernel[0]: [0] "Clock Slew" Id:0 MetaState:0 "Dynamic Power Step" kernel[0]: [1] "PowerMac8,1 A System Fans" Id:1 MetaState:0 "Normal" kernel[0]: [2] "CPU Fan" Id:2 MetaState:0 kernel[0]: ---------------------------------

Yep, hardware/firmware fault. Ring Apple.

Cheers,

Chris

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