Heliphoto,
Thanks for the thoughtful, detailed response. I wouldn't have known about the Sys Log. I looked at it after a shutdown and you are right, it shows the detection of thermal overload. (Wayne, CatOne, you were right) Here is what it contained. Note the first line and the last line:
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: PowerMac7,3 Thermal Manager: Thermal Runaway Detected: System Will Sleep
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: PM73 T_cur=103 >= (T_max:83 + sleepOffset:20)
Apr 28 13:24:31 brads-power-mac-g5 pppd[135]: Connection terminated.
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: PowerMac7_2_PlatformPlugin core dump:
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: IOHWControls:
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]:
- "PWR SUPPLY" Type:"fan-pwm" Id:8960 TGT:16 CUR:42
Apr 28 13:24:31 brads-power-mac-g5 pppd[135]: PPPoE disconnecting...\n
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: ASC::setProperties ERROR: invalid OSNumber
Apr 28 13:24:31 brads-power-mac-g5 pppd[135]: PPPoE disconnected\n
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [1] "Clock Slew" Type:"slew" Id:16 TGT:0 CUR:0
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [2] "CPU A ACS" Type:"fan-rpm" Id:16384 TGT:3200 CUR:0
Apr 28 13:24:31 brads-power-mac-g5 configd[38]: posting notification com.apple.system.config.network_change
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [3] "CPU B ACS" Type:"fan-rpm" Id:16640 TGT:3200 CUR:1878
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [4] "CPU A Intake Fan" Type:"fan-rpm" Id:17152 TGT:3104 CUR:1224
Apr 28 13:24:31 brads-power-mac-g5 configd[38]: setting hostname to "brads-power-mac-g5.local"
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [5] "CPU A Exhaust Fan" Type:"fan-rpm" Id:17408 TGT:3200 CUR:1431
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [6] "CPU B Intake Fan" Type:"fan-rpm" Id:17664 TGT:3104 CUR:1435
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [7] "CPU B Exhaust Fan" Type:"fan-rpm" Id:17920 TGT:3200 CUR:1389
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [8] "Drive Bay Fan" Type:"fan-rpm" Id:16896 TGT:1000 CUR:996
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [9] "AGP/PCI Slot Fan" Type:"fan-pwm" Id:18944 TGT:11 CUR:1320
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [10] "U3/Backside Fan" Type:"fan-pwm" Id:18688 TGT:7 CUR:840
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: IOHWSensors:
Apr 28 13:24:31 brads-power-mac-g5 lookupd[229]: lookupd (version 369.5) starting - Mon Apr 28 13:24:31 2008
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]:
- "CPU A POWER" Type:"power" Id:48 CUR:78.14793 W
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [1] "CPU B POWER" Type:"power" Id:49 CUR:89.17296 W
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [2] "CPU B AD7417 AD4" Type:"current" Id:19 CUR:62.32768 A
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [3] "BACKSIDE" Type:"temperature" Id:6 CUR:23.57344 C
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [4] "U3 HEATSINK" Type:"temperature" Id:7 CUR:76.0 C
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [5] "CPU A AD7417 AD2" Type:"current" Id:12 CUR:6.15584 A
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [6] "CPU A AD7417 AD3" Type:"voltage" Id:13 CUR:1.27584 V
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [7] "CPU B AD7417 AD1" Type:"temperature" Id:16 CUR:103.54890 C
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [8] "CPU B AD7417 AD2" Type:"current" Id:17 CUR:6.29184 A
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [9] "CPU B AD7417 AMB" Type:"temperature" Id:15 CUR:26.16384 C
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [10] "CPU A AD7417 AMB" Type:"temperature" Id:10 CUR:26.16384 C
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [11] "CPU A AD7417 AD1" Type:"temperature" Id:11 CUR:89.37616 C
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [12] "CPU A AD7417 AD4" Type:"current" Id:14 CUR:55.3520 A
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [13] "CPU B AD7417 AD3" Type:"voltage" Id:18 CUR:1.28064 V
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [14] "DRIVE BAY" Type:"temperature" Id:4 CUR:28.0 C
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [15] "SLOT 12V" Type:"power" Id:20480 CUR:0.0 W
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [16] "SLOT 5V" Type:"power" Id:20736 CUR:0.0 W
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [17] "SLOT 3.3V" Type:"power" Id:20992 CUR:0.0 W
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [18] "SLOT COMBINED" Type:"power" Id:21248 CUR:8.56729 W
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: IOHWCtrlLoops:
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]:
- "U3/Backside Fan" Id:7 MetaState:0 "Normal"
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [1] "CPU Cooling" Id:6 MetaState:0
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [2] "Clock Slew" Id:0 MetaState:0 "Dynamic Power Step"
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [3] "Drive Bay Fan" Id:1 MetaState:0 "Normal"
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: [4] "PCI Slot Fan" Id:5 MetaState:0 "Normal"
Apr 28 13:24:31 brads-power-mac-g5 kernel[0]: ---------------------------------
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: PowerMac7,3 Thermal Manager: Thermal Runaway Detected: System Will Sleep
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: PM73 T_cur=104 >= (T_max:83 + sleepOffset:20)
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: PowerMac7_2_PlatformPlugin core dump:
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: IOHWControls:
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]:
- "PWR SUPPLY" Type:"fan-pwm" Id:8960 TGT:16 CUR:42
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: ASC::setProperties ERROR: invalid OSNumber
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [1] "Clock Slew" Type:"slew" Id:16 TGT:1 CUR:1
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [2] "CPU A ACS" Type:"fan-rpm" Id:16384 TGT:3200 CUR:0
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [3] "CPU B ACS" Type:"fan-rpm" Id:16640 TGT:3200 CUR:2124
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [4] "CPU A Intake Fan" Type:"fan-rpm" Id:17152 TGT:3104 CUR:1514
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [5] "CPU A Exhaust Fan" Type:"fan-rpm" Id:17408 TGT:3200 CUR:1765
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [6] "CPU B Intake Fan" Type:"fan-rpm" Id:17664 TGT:3104 CUR:1784
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [7] "CPU B Exhaust Fan" Type:"fan-rpm" Id:17920 TGT:3200 CUR:1737
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [8] "Drive Bay Fan" Type:"fan-rpm" Id:16896 TGT:1000 CUR:997
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [9] "AGP/PCI Slot Fan" Type:"fan-pwm" Id:18944 TGT:11 CUR:1318
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [10] "U3/Backside Fan" Type:"fan-pwm" Id:18688 TGT:7 CUR:844
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: IOHWSensors:
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]:
- "CPU A POWER" Type:"power" Id:48 CUR:78.60262 W
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [1] "CPU B POWER" Type:"power" Id:49 CUR:89.50186 W
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [2] "CPU B AD7417 AD4" Type:"current" Id:19 CUR:62.48768 A
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [3] "BACKSIDE" Type:"temperature" Id:6 CUR:23.57344 C
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [4] "U3 HEATSINK" Type:"temperature" Id:7 CUR:76.0 C
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [5] "CPU A AD7417 AD2" Type:"current" Id:12 CUR:6.15584 A
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [6] "CPU A AD7417 AD3" Type:"voltage" Id:13 CUR:1.27584 V
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [7] "CPU B AD7417 AD1" Type:"temperature" Id:16 CUR:104.47254 C
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [8] "CPU B AD7417 AD2" Type:"current" Id:17 CUR:6.29184 A
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [9] "CPU B AD7417 AMB" Type:"temperature" Id:15 CUR:26.16384 C
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [10] "CPU A AD7417 AMB" Type:"temperature" Id:10 CUR:26.16384 C
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [11] "CPU A AD7417 AD1" Type:"temperature" Id:11 CUR:90.15648 C
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [12] "CPU A AD7417 AD4" Type:"current" Id:14 CUR:55.35520 A
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [13] "CPU B AD7417 AD3" Type:"voltage" Id:18 CUR:1.28224 V
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [14] "DRIVE BAY" Type:"temperature" Id:4 CUR:28.0 C
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [15] "SLOT 12V" Type:"power" Id:20480 CUR:0.0 W
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [16] "SLOT 5V" Type:"power" Id:20736 CUR:0.0 W
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [17] "SLOT 3.3V" Type:"power" Id:20992 CUR:0.0 W
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [18] "SLOT COMBINED" Type:"power" Id:21248 CUR:8.56524 W
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: IOHWCtrlLoops:
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]:
- "U3/Backside Fan" Id:7 MetaState:0 "Normal"
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [1] "CPU Cooling" Id:6 MetaState:0
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [2] "Clock Slew" Id:0 MetaState:0 "Dynamic Power Step"
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [3] "Drive Bay Fan" Id:1 MetaState:0 "Normal"
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: [4] "PCI Slot Fan" Id:5 MetaState:0 "Normal"
Apr 28 13:24:32 brads-power-mac-g5 kernel[0]: ---------------------------------
Apr 28 13:24:34 brads-power-mac-g5 kernel[0]: System Sleep
I'll post this over at macoshints.com as you suggested. Maybe someone there will pick up which of the sensors was showing problem, and that way I can help the Apple store when I take it in. I have Applecare, so hopefully, this is fixable. I'll also try some other cpu intensive things and see if that will do the same thing.
Brad