My Early 2008 iMac freeze with no apparent reason

I have an Early 2008 iMac (2.66GHz Core 2 Duo with 4GB RAM).
Since installing Lion, sometimes the computer freezes without apparent reason.
The only thing I'm sure is that this is NOT the same as the Quicktime video problem – I wasn't watching a Quicktime video, nor a Flash website when it froze. Actually, today happened while I wasnt' doing anything: the computer was on, but I was at launch.
Anyway, what happens is really strange: the screen freeze, I can't do things like change volume, but the mouse still works – albeit without producing results on screen such as dock magnification etc. Also, while the computer was frozen a Time Machine backup occured as scheduled, and I was able to stream my computer's music to my iPhone using the Home Sharing feature.
The clock also remain frozen (at 12:51), so I looked at the logs and this is what I found:
11/01/12 12:46:42,783 iTunes: _NotificationSocketReadCallbackGCD (thread 0x7fff73778960): Unexpected connection closure...
11/01/12 12:55:58,614 com.apple.usbmuxd: _SendAttachNotification (thread 0x7fff73778960): sending attach for device 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.: _GetAddrInfoReplyReceivedCallback matched.
11/01/12 12:55:58,898 usbmuxd: _AMDeviceConnectByAddressAndPort (thread 0x101281000): IPv4
11/01/12 12:55:59,072 ath: _AMDDeviceAttachedCallbackv3 (thread 0x7fff73778960): Device 'AMDevice 0x10185aa80 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 33, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 12:55:59,072 iTunes: _AMDDeviceAttachedCallbackv3 (thread 0x10fced000): Device 'AMDevice 0x7f9122ee51f0 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 33, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 12:56:00,758 AppleMobileDeviceHelper: _AMDDeviceDetached (thread 0xacbba2c0): Device 'AMDevice 0x52ea00 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 32, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' detached.
11/01/12 12:56:01,682 AppleMobileDeviceHelper: _AMDDeviceAttachedCallbackv3 (thread 0xacbba2c0): Device 'AMDevice 0x33b210 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 33, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 12:56:34,322 com.apple.usbmuxd: _SendDetachNotification (thread 0x7fff73778960): sending detach for device 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.: _BrowseReplyReceivedCallback got bonjour removal.
11/01/12 12:56:34,322 iTunes: _AMDDeviceDetached (thread 0x10fced000): Device 'AMDevice 0x7f9122ee51f0 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 33, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' detached.
11/01/12 12:56:34,324 iTunes: _NotificationSocketReadCallbackGCD (thread 0x7fff73778960): Unexpected connection closure...
11/01/12 13:00:22,505 com.apple.usbmuxd: _SendAttachNotification (thread 0x7fff73778960): sending attach for device 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.: _GetAddrInfoReplyReceivedCallback matched.
11/01/12 13:00:22,974 usbmuxd: _AMDeviceConnectByAddressAndPort (thread 0x100781000): IPv4
11/01/12 13:00:23,344 iTunes: _AMDDeviceAttachedCallbackv3 (thread 0x10fced000): Device 'AMDevice 0x7f9123cc9db0 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 34, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 13:00:23,344 ath: _AMDDeviceAttachedCallbackv3 (thread 0x7fff73778960): Device 'AMDevice 0x10186ccf0 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 34, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 13:00:25,583 AppleMobileDeviceHelper: _AMDDeviceDetached (thread 0xacbba2c0): Device 'AMDevice 0x33b210 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 33, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' detached.
11/01/12 13:00:26,228 AppleMobileDeviceHelper: _AMDDeviceAttachedCallbackv3 (thread 0xacbba2c0): Device 'AMDevice 0x549be0 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 34, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 13:01:51,000 kernel: ** Device in slot: SLOT--1 **
11/01/12 13:01:51,000 kernel: ** GPU Debug Info Start **
11/01/12 13:01:51,000 kernel: 0x00009583
11/01/12 13:01:51,000 kernel: 0x000000d6
11/01/12 13:01:51,000 kernel: 0x00000001
11/01/12 13:01:51,000 kernel: 0x00000018
11/01/12 13:01:51,000 kernel: 0x0000d052
11/01/12 13:01:51,000 kernel: 0x00000001
11/01/12 13:01:51,000 kernel: 0x00000001
11/01/12 13:01:51,000 kernel: 0x00009583
11/01/12 13:01:51,000 kernel: 0x00000001
11/01/12 13:01:51,000 kernel: 0x00000015
11/01/12 13:01:51,000 kernel: 0x00000000
11/01/12 13:01:51,000 kernel: 0x00000001
It goes on like this for a while, then:
11/01/12 13:02:10,000 kernel: 0xffffffff
11/01/12 13:02:10,000 kernel: 0xffffffff
11/01/12 13:02:10,000 kernel: 0xffffffff
11/01/12 13:02:10,000 kernel: 0xffffffff
11/01/12 13:02:10,000 kernel: 0xffffffff
11/01/12 13:02:10,000 kernel: 0xc0016900
11/01/12 13:02:10,000 kernel: 0x000001b1
11/01/12 13:02:10,000 kernel: 0x00000004
11/01/12 13:02:10,000 kernel: 0xc0016900
11/01/12 13:02:10,000 kernel: 0x00000207
11/01/12 13:02:10,000 kernel: ** GPU Debug Info End **
11/01/12 13:05:56,965 com.apple.usbmuxd: _SendDetachNotification (thread 0x7fff73778960): sending detach for device 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.: _BrowseReplyReceivedCallback got bonjour removal.
11/01/12 13:05:56,966 iTunes: _AMDDeviceDetached (thread 0x10fced000): Device 'AMDevice 0x7f9123cc9db0 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 34, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' detached.
11/01/12 13:05:56,967 iTunes: _NotificationSocketReadCallbackGCD (thread 0x7fff73778960): Unexpected connection closure...
11/01/12 13:07:21,408 com.apple.usbmuxd: _SendAttachNotification (thread 0x7fff73778960): sending attach for device 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.: _GetAddrInfoReplyReceivedCallback matched.
11/01/12 13:07:21,877 usbmuxd: _AMDeviceConnectByAddressAndPort (thread 0x100781000): IPv4
11/01/12 13:07:22,308 iTunes: _AMDDeviceAttachedCallbackv3 (thread 0x10fced000): Device 'AMDevice 0x7f9123a21160 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 35, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 13:07:22,308 ath: _AMDDeviceAttachedCallbackv3 (thread 0x7fff73778960): Device 'AMDevice 0x10185aa80 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 35, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 13:07:26,592 AppleMobileDeviceHelper: _AMDDeviceDetached (thread 0xacbba2c0): Device 'AMDevice 0x549be0 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 34, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' detached.
11/01/12 13:07:27,131 AppleMobileDeviceHelper: _AMDDeviceAttachedCallbackv3 (thread 0xacbba2c0): Device 'AMDevice 0x362950 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 35, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 13:16:39,785 com.apple.backupd: Starting standard backup
11/01/12 13:16:40,019 com.apple.backupd: Backing up to: /Volumes/Backup di Time Machine/Backups.backupdb
11/01/12 13:17:14,751 com.apple.backupd: 2.43 GB required (including padding), 16.27 GB available
11/01/12 13:17:30,700 mdworker: Unable to talk to lsboxd
11/01/12 13:19:01,344 com.apple.backupd: Copied 4087 files (381.2 MB) from volume Macintosh HD.
11/01/12 13:19:11,801 com.apple.backupd: 2.27 GB required (including padding), 15.89 GB available
11/01/12 13:20:14,819 com.apple.backupd: Copied 3098 files (230.8 MB) from volume Macintosh HD.
11/01/12 13:20:23,700 mds: (Error) Volume: Could not find requested backup type:2 for volume
11/01/12 13:20:24,205 com.apple.backupd: Starting post-backup thinning
11/01/12 13:20:37,674 com.apple.backupd: Deleted /Volumes/Backup di Time Machine/Backups.backupdb/Galactica/2012-01-10-123033 (146.3 MB)
11/01/12 13:20:37,674 com.apple.backupd: Post-back up thinning complete: 1 expired backups removed
11/01/12 13:20:37,800 com.apple.backupd: Backup completed successfully.
11/01/12 13:55:00,567 com.apple.usbmuxd: _SendDetachNotification (thread 0x7fff73778960): sending detach for device 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.: _BrowseReplyReceivedCallback got bonjour removal.
11/01/12 13:55:00,568 iTunes: _AMDDeviceDetached (thread 0x10fced000): Device 'AMDevice 0x7f9123a21160 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 35, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' detached.
11/01/12 13:55:00,569 iTunes: _NotificationSocketReadCallbackGCD (thread 0x7fff73778960): Unexpected connection closure...
11/01/12 13:57:12,071 com.apple.usbmuxd: _SendAttachNotification (thread 0x7fff73778960): sending attach for device 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.: _GetAddrInfoReplyReceivedCallback matched.
11/01/12 13:57:12,379 usbmuxd: _AMDeviceConnectByAddressAndPort (thread 0x100781000): IPv4
11/01/12 13:57:12,550 iTunes: _AMDDeviceAttachedCallbackv3 (thread 0x10fced000): Device 'AMDevice 0x7f9123c28390 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 36, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 13:57:12,550 ath: _AMDDeviceAttachedCallbackv3 (thread 0x7fff73778960): Device 'AMDevice 0x10186ccf0 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 36, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 13:57:14,574 AppleMobileDeviceHelper: _AMDDeviceDetached (thread 0xacbba2c0): Device 'AMDevice 0x362950 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 35, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' detached.
11/01/12 13:57:14,815 AppleMobileDeviceHelper: _AMDDeviceAttachedCallbackv3 (thread 0xacbba2c0): Device 'AMDevice 0x37d1d0 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 36, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 13:57:35,961 com.apple.usbmuxd: _SendDetachNotification (thread 0x7fff73778960): sending detach for device 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.: _BrowseReplyReceivedCallback got bonjour removal.
11/01/12 13:57:35,961 iTunes: _AMDDeviceDetached (thread 0x10fced000): Device 'AMDevice 0x7f9123c28390 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 36, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' detached.
11/01/12 13:57:35,962 iTunes: _NotificationSocketReadCallbackGCD (thread 0x7fff73778960): Unexpected connection closure...
11/01/12 14:05:14,778 com.apple.usbmuxd: _SendAttachNotification (thread 0x7fff73778960): sending attach for device 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.: _GetAddrInfoReplyReceivedCallback matched.
11/01/12 14:05:15,177 usbmuxd: _AMDeviceConnectByAddressAndPort (thread 0x100781000): IPv4
11/01/12 14:05:15,342 ath: _AMDDeviceAttachedCallbackv3 (thread 0x7fff73778960): Device 'AMDevice 0x10185aa80 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 37, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
11/01/12 14:05:15,342 iTunes: _AMDDeviceAttachedCallbackv3 (thread 0x10fced000): Device 'AMDevice 0x7f9122fad930 {UDID = 8851d03d087cdedc1ee4cd34f58d63e07cd164e8, device ID = 37, FullServiceName = 00:26:bb:fc:33:cf@fe80::226:bbff:fefc:33cf._apple-mobdev._tcp.local.}' attached.
At this point I restarted the computer using the power button.
For the record, a few months ago I replaced the hard drive thinking it could be the problem – good thing I needed more space anyway because it happened twice AFTER I replaced it.
Any help?

Welcome to Lion, I have 10.7.4 and this has been a problem every two weeks or so since 10.7.1. Fun.

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Report generated December 20, 2014 at 1:40:32 PM CST
Click the [Support] links for help with non-Apple products.
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Hardware Information: ℹ️
iMac (24-inch, Early 2008) (Verified)
iMac - model: iMac8,1
1 2.8 GHz Intel Core 2 Duo CPU: 2-core
4 GB RAM Upgradeable
BANK 0/DIMM0
2 GB DDR2 SDRAM 800 MHz ok
BANK 1/DIMM1
2 GB DDR2 SDRAM 800 MHz ok
Bluetooth: Old - Handoff/Airdrop2 not supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
ATI Radeon HD 2600 Pro - VRAM: 256 MB
iMac 1920 x 1200
System Software: ℹ️
OS X 10.9.5 (13F34) - Uptime: 21:42:10
Disk Information: ℹ️
Hitachi HDP725032GLA380 disk0 : (320.07 GB)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 319.21 GB (204.84 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information: ℹ️
Apple Inc. Built-in iSight
Logitech USB Receiver
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/System/Library/Extensions
[not loaded] com.seagate.driver.PowSecDriverCore (5.0.1) [Support]
/System/Library/Extensions/Seagate Storage Driver.kext/Contents/PlugIns
[not loaded] com.seagate.driver.PowSecLeafDriver_10_4 (5.0.1) [Support]
[not loaded] com.seagate.driver.PowSecLeafDriver_10_5 (5.0.1) [Support]
[not loaded] com.seagate.driver.SeagateDriveIcons (5.0.1) [Support]
Startup Items: ℹ️
HP IO: Path: /Library/StartupItems/HP IO
Startup items are obsolete in OS X Yosemite
Launch Agents: ℹ️
[running] com.seagate.SeagateStorageGauge.plist [Support]
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist [Support]
[running] com.memeo.Memeod.plist [Support]
User Launch Agents: ℹ️
[loaded] com.google.keystone.agent.plist [Support]
[invalid?] com.leadertech.PowerRegister.EPS2.fa8d34509cfddcea6fdfd2f145193825.plist [Support]
User Login Items: ℹ️
iTunesHelper UNKNOWN (missing value)
Internet Plug-ins: ℹ️
DirectorShockwave: Version: 11.5.0r600 [Support]
Flash Player: Version: 15.0.0.246 - SDK 10.6 Mismatch! Adobe recommends 16.0.0.235
FlashPlayer-10.6: Version: 15.0.0.246 - SDK 10.6 [Support]
iPhotoPhotocast: Version: 7.0
QuickTime Plugin: Version: 7.7.3
Default Browser: Version: 537 - SDK 10.9
User internet Plug-ins: ℹ️
BrowserPlus_2.9.8: Version: 2.9.8 [Support]
Move-Media-Player: Version: npmnqmp 071505000006 [Support]
3rd Party Preference Panes: ℹ️
BrowserPlus [Support]
Flash Player [Support]
Time Machine: ℹ️
Skip System Files: NO
Mobile backups: OFF
Auto backup: NO - Auto backup turned off
Destinations:
FreeAgent GoFlex Drive [Local]
Total size: 1.00 TB
Total number of backups: 1
Oldest backup: 2014-06-08 05:27:16 +0000
Last backup: 2014-06-08 05:27:16 +0000
Size of backup disk: Excellent
Backup size 1.00 TB > (Disk size 0 B X 3)
Top Processes by CPU: ℹ️
      2% WindowServer
      2% com.apple.WebKit.WebContent
      1% fontd
      0% AppleSpell
      0% aosnotifyd
Top Processes by Memory: ℹ️
292 MB Safari
219 MB com.apple.WebKit.WebContent
180 MB mds_stores
150 MB softwareupdated
120 MB installd
Virtual Memory Information: ℹ️
1.61 GB Free RAM
1.86 GB Active RAM
277 MB Inactive RAM
543 MB Wired RAM
626 MB Page-ins
0 B Page-outs
Diagnostics Information: ℹ️
Dec 19, 2014, 03:58:57 PM Self test - passed

Early 2008 iMac crashing-possibly overheating

Hi,
Please bear with me on the slightly lengthy post here. I want to provide as much info as seems relevant.
I have an early 2008 iMac that recently started crashing. It just locks up and the screen get a lot of screwy stuff on it. After turning it off for a while it works OK for a time. I've noticed it seems to happen when I'm editing video (with iMovie), which is my primary use for this machine.
Here are the system specs:
Model Name:iMac
Model Identifier:iMac8,1
Processor Name:Intel Core 2 Duo
Processor Speed:3.06 GHz
Number Of Processors:1
Total Number Of Cores:2
L2 Cache:6 MB
Memory:4 GB
Bus Speed:1.07 GHz
Boot ROM Version:IM81.00C1.B00
SMC Version (system):1.30f
OS 10.8
I took it to my local authorized reseller/service provider to have them check it out. They did some diagnostics and said there was some sort of hardware problem, but the machine is considered obsolete and parts were not available for them to repair it so there was no point in my paying the diagnostic fee for them to pinpoint the problem.
I took it back home, plugged it back in and it worked fine for a few minutes and then locked up again. I noticed the back of the screen felt pretty hot to the touch, especially the rear upper left quadrant.
I started searching and found a fan controller program (I can't remember the name but it's the one everyone was recommending), I installed it and set the fan speeds all to around 3200 rpms or so. That seems to help lower the temps but I didn't log the temps. The temp showing at the top right or the screen was hovering around 115 F.
I tried to figure out how to run a hardware diagnostic but apparently I need the original start up disc and I don't have it.
So (now my questions)...
1- How, if possible, can I try to determine the underlying issue that could be causing the machine to get too hot?
2- What is too hot?
3- Does anything jump out at you based on the above info?
4- Any good recommendations on repair options?
I am saving for a new machine but not quite there yet. This was my first Mac, I bought it used last year from a friend who was moving. I am completely sold on Apple now but I need to get at least a few more months out of this one if possible.
Thanks fro any help and advice. I appreciate it!
Bryan

The first thing to do when you suspect overheating is to clean the air intake vents on the bottom edge of the case. While there, remove the RAM dorr and check the RAM bay. Some really big dust bunnies can take up residence in the RAM bay.
Make sure the exhaust slot at the top of the case back is clear and at least six inches (~150mm) for any part of your deks r the wall behind.
Also look at stuff on your desk directly under the computer. The only iMac overheating episode I've encountered was when someone left me a ziplock bag of CD sleeves. They shoved the bag directly under the computer case and the bag was within millimeters of the air intakes. Even though only about 7 inches of the roughly 25 inches of air vents were occluded, the temp monitor in my menubar and an independent thermometer with which I monitor exhaust air temperature both showed the computer running a little hotter than normal. I removed the bag and hte temps quickly fell back to norma.
Some utility software that seems innocent enough can run up your temps. Anti-virus and internet security programs can do it. So can so-called "cleaning" and "optimization" software. Third-party backup software such as that which comes with many "name-brand" external hard drives can affect running temps.
Can you give us and idea of what third-aparty utilities cae installed?
Did the tech at Apple say anything specific about what kind of hardware problem you have?

Early 2008 iMac (8,1) randomly goes into sleep mode

Hey,
My early 2008 iMac (8,1) on 10.8.2 goes into sleep mode by itself. I've played around in Energy Saver, tried resetting SMC, NVRAM, replaced HDD, reformatted HDD, installed smcFanControl, reinstalled Snow Leopard, Lion, Mountain Lion. None of that worked. Took it to the Genius bar, performed some diagnostics tests and they said everything worked properly. Does anybody have the same problem? I can still use the computer for general computer use (light web surfing and e-mailing), but it seems to go into sleep mode when I have a lot of applications open and especially when watching videos. I've tried researching this problem, but I've haven't found a definitive answer. Right now, the Genius that I've been talking to thinks it may be the RAM. I'm waiting on new shipments of test RAM to arrive at the Apple Store for him to properly diagnose.
Thanks,
Jason
iMac (8,1)
2.8 GHz Intel Core 2 Duo
2x2 GB 800 MHz DDR2 SDRAM
ATI Radeon HD 2600 Pro 256 MB
1TB 7200 RPM SATA ST1000DM003-1CH162
If you want to read the whole time line, I've included it here. I apologize for it being so long.
At first I was running Lion (10.7.5) and the computer would enter sleep mode whenever I was doing anything with video. For example, watching YouTube videos and chatting on FaceTime. And funny enough, I distinctly remember watching a bunch of movies with VLC and the computer did not go to sleep (Although, this is not true anymore). I could wake the computer up and use it, however within a few minutes the computer would re-enter sleep mode. The computer seemed fine and I could access all of my files. Tried resetting SMC and it did not resolve the issue.
I made a Genius appointment to see if they were familiar with the issue. The iMac passed the in-store diagnostics test; it said all the components were functioning properly. He told me to bring it home to do a fresh re-install of my OS and then run my computer to see if the problem persisted. I took it home and reformatted my HDD with a 35-pass erase, re-installed Snow Leopard (10.6.8) and declined to transfer any backups from Time Machine. I was using a fresh system and sure enough, the problem persited. Tried doing the same thing again but with Lion (10.7.5) and still no luck. So I made another appointment and it passed the in-store diagnostics test again. I let them keep the computer for a 24-hour diagnostics test. They told me they would diagnose my computer with the OS on my HDD as well as a copy of OS that the Apple store deemed 'good' on an external HDD. The Genius called me and told me that my HDD failed their 24-hour diagnostics test and recommended I replace it. I initially had a 750 GB HDD, and the Apple Store could only offer me a 500 GB HDD ($200). I opted to take my computer to Carbon Computing, an authorized dealer in Toronto, to have a 1 TB Seagate HDD ($170) installed with no OS on it. I brought it home, performed another 35-pass erase and installed Snow Leopard. Problem still persisted. Repeated with Lion, still unsuccessful. Looking back, I was so excited that I just had to replace the HDD to fix the problem, I forgot to ask the guy if he could recreate the issue.
I began to suspect that it was a heating issue. So I installed Temperature Monitor and smcFanControl, and cleaned the fans as much as I could without taking the computer apart. Without smcFC on I tried to recreate the problem and I noticed that the Power Supply Position 1 reached 95 degrees Celsius, and Graphics Processor Temperature Diode reached 97 degrees Celsius before entering sleep mode. I don't know much about temperature sensors and what they monitor specifically, and so I couldn't draw any conclusions from that data. I turned on smcFC and cranked the optical drive speed to 2000 RPM, HDD to 3000, and CPU to 3000. The computer still went to sleep but the temperatures were below 90 degrees Celsius before entering sleep mode. I've tried researching here and on the internet about normal operating temperature ranges of iMacs and generally found that most do reached that temperature but they do not go to sleep mode.
Then I thought it may be a problem with Lion so I upgraded to Mountain Lion. The issue still persisted. Tried resetting SMC and NVRAM, did not resolve issue.
I called the same Apple Store explaining to them that their recommendation of replacing the HDD did not resolve the issue. They told me to bring it in and have them check it out again. I went through the same process I did before; the iMac passed all of their diagnostic tests. The Genius told me this time he will test out the RAM. He called me and told me that he could replicate the problem and so he proceeded to put in a stick of 'good' Apple RAM, but the computer would not work. He said the 'good' Apple RAM was damaged, either before or in the process of putting it in. He plugged in my old stick of RAM and the computer worked. He tried to recreate the problem and claimed that the computer ran for over 24 hours with an existing movie on my HDD playing and it did not go to sleep mode. However, once I brought it home I played the same movie right away and it turned off 17 minutes into the movie. Tried resetting SMC and NVRAM again, ran the movie again, still went to sleep.
And that's the story for now...

Now to find out WHY it does it at home only. How hot is it at home? Have you checked the AC current/voltage at home?
Well they were able to replicate the issue at the Apple Store the second time I left my computer there. Anyway, we don't have any heating on at my house at the moment. It's usually from around 20-23 degrees Celsius (72-75 F). Temperature Monitor says ambient temperature is 30 degree C though...
I'm not really sure how to check the AC current/voltage at home, but my computer worked before I moved it. So I'm not sure if that is the issue.
I normally only have speakers set up to my computer and a wired keyboard. The speakers are powered separately. I would assume that at the Apple Store only the power cord and wired keyboard are connected.
What is the Power Supply Position? And what does it do?
Thanks for your help!

Windows 7 Pro 64-Bit on Early 2008 iMac - No CD/DVD Driver error

Hi,
I'm trying to install Windows 7 64-bit on my early 2008 iMac and its failing at the point after I click "Start Install" in the Windows 7 installation.
Its complaining that I don't have the required CD/DVD drivers, and prompts me to insert a disk/usb drive. Well, I can't find a way to eject the Win7 disk.
Is there a way around this? Or am I going to have to install Win7 32-bit? Will my licence for the 64-bit version work with a 32-bit version instead??
Thanks

Hi
You dont need to change the booting order in BIOS.
You can boot from CD/DVD drive using another way
Press F12 after notebook has powered up
Then a boot menu should appear there you should choose the ODD as booting device and should press ENTER.
This would enable the booting from CD/DVD drive
You can also press the C button immediately after notebook has powered up this should enable CD/DVD drive as well.!

I have Garageband version 4.1.2 (248.7) installed on my early 2008 IMAC Version 10.5.8. I have never upgraded but have a LOT of projects. If I upgrade my operating system to the next level (10.6?), will my GB version still work? Do I need to upgrade GB?

I have Garageband version 4.1.2 (248.7) installed on my early 2008 IMAC 10.5.8. I have never upgraded. If I upgrade my operating system to the next level (10.6?) will my GB version still work? I have a LOT of projects involved and hope they will transfer. Can I (and should I) upgrade GB at the same time and how far should I go with that without causing a problem with my projects? What would I gain if I upgrade GB? Thanks!

Nancyfromeasttexas wrote:
I have Garageband version 4.1.2 (248.7) [...] If I upgrade my operating system to the next level (10.6?) will my GB version still work?
my copy of 4.1.2 appears to work under 10.6.8, though i have not done extensive tests
Nancyfromeasttexas wrote:
I have a LOT of projects involved and hope they will transfer.
they should
Nancyfromeasttexas wrote:
Can I (and should I) upgrade GB at the same time
sure
Nancyfromeasttexas wrote:
(and should I) upgrade GB at the same time
v4 is pretty lonh in the tooth now, and GB only costs $15, so I'd think it's a good idea
Nancyfromeasttexas wrote:
how far should I go with that without causing a problem with my projects?
the only version you can buy new is v6,a nd it should open older projects without issue ... however you could keep 4 around:
http://www.bulletsandbones.com/GB/GBFAQ.html#installnewkeepold
(Let the page FULLY load. The link to your answer is at the top of your screen)
Nancyfromeasttexas wrote:
What would I gain if I upgrade GB?
v5:
http://www.bulletsandbones.com/GB/GBFAQ.html#whatsnew09
(Let the page FULLY load. The link to your answer is at the top of your screen)
v6:
http://www.bulletsandbones.com/GB/GBFAQ.html#whatsnew11
(Let the page FULLY load. The link to your answer is at the top of your screen)

What version of windows is best to run on an Early 2008 IMac?

What version of Windows is best to run on an Early 2008 IMac? And should I use Boot Camp, Parallels, or VMWare? My IMac will be a secondary computer now that I got a new IMac. The Early 2008 IMac is an Intel Core 2 Duo with 2GB memory, and 2.66 ghz processor speed. It is also running OSX 10.9.5 and Boot Camp is version 5.1.2.
I mostly want to do this so I can get rid of an old Windows machine that I just use to run Quicken on. I think I need to do this since Intuit does not support online bill pay for Apple versions of Quicken.
I am average with computers so any help would be really appreciated.
Thanks
Rocco

Bootcamp gives you access to underlying hardware on the iMac unlike VMware or Parallels. It does require reboot. Most VM engines let you take a Bootcamp Windows and run it as VM where a reboot can be avoided. With 2GB of memory, you should be able to Windows 7, but I would not recommend W8.
You may also want to look at - Boot Camp: System requirements for Microsoft Windows operating systems.

How to erase a early 2008 iMac Hard drive when the screen is dead

My early 2008 iMac's Graphics Module has died for the third and last time. I want to erase the Hard Drive before I offer it up for sale as parts or just re-cycling. But with the Graphics Module dead it will not boot up, therefore no display. So how do I erase my data and restore to a clean OS?

Make sure that your old Mac will boot into disk mode then buy this Thunderbolt to Firewire Adapter

My Early 2008 iMac freeze with no apparent reason

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