IMac 24-inch 2.4 GHz (circa 2007) freezes, reboots after several hours

Looked through all the other discussion topics and saw somewhat related issues, but my older system is acting very strange.
Starting back in October 2010, the system starting slowing down (heard the HD writing (clicking away)). Seemed to happen when a lot of windows were open. Reboot after reboot. About 2 weeks ago the system wouldn't reboot - tried all the special boot letters and buttons, no help. Took the system to the local "genius bar" - not much help, but they were able to reboot the system. They recommended backing up our personal data files in case it crashed. Did that. System continued to operate progressively slower each day. Thanksgiving weekend, wiped the HD and reloaded all the software, loaded Mac OS X (10.4.11), my older system can't load 10.5 or higher due to compatibility.
Now experiencing same problems as before, but iTunes now skips (new problem), system becomes unresponsive - freezes. Attempt to reboot results in the white screen of death with the question mark in the folder icon in the middle of the screen. But, after waiting a long time, overnight or 3 to 4 hours after being off, the system does reboot and operate fine. This seems very strange. Why would the system become so inoperable after performing fine? The only thing I can think of is that the system is overheating. So I loaded the temp widget (iStat Pro - very cool app) which provides instantaneous temp info on internal components, but I can't figure out how to data log the temp data so as to track temp rise trends.
Anyway, anybody have any recommendations?

It sounds like your HD is failing. First _do a full system backup immediately!!!!!!_
Then you can do some checks, first is check the S.M.A.R.T. status in Disk Utility (Applications-Utilities-Disk Utility) The status should say Verified, if it says anything else then your disk is definitely in trouble.
If the status is Verified then do an Apple Hardware Test following the instructions here:
http://support.apple.com/kb/ht1509
This will test your system, if it comes back with error codes please post back and we can give you an idea what they mean. However as I mentioned originally I think your HD is getting ready to fail.
Roger

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How much free disk space is available? Right or control click the MacintoshHD icon on your Desktop, then click: Get Info. In the Get Info window, click the discovery triangle so it's facing down. You will see; Capacity and Available Make sure you have 10% available disk space, 15% is way better.
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We have an iMac 24-inch Mid 2007 with maximum of 4G bytes of SDRAM, with OX X 10.9.4 Mavericks. It is routinely locking-up with the rainbow wheel. Especially with iTunes and Safari. Ideas?

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EtreCheck version: 1.9.14 (50)
Report generated August 18, 2014 at 6:05:39 PM PDT
Hardware Information: ?
iMac (24-inch Mid 2007) (Verified)
iMac - model: iMac7,1
1 2.8 GHz Intel Core 2 Duo CPU: 2 cores
4 GB RAM
Video Information: ?
ATI,RadeonHD2600 - VRAM: 256 MB
iMac 1920 x 1200
System Software: ?
OS X 10.9.4 (13E28) - Uptime: 1 day 4:11:27
Disk Information: ?
Hitachi HDS721010KLA330 disk0 : (1 TB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted>: 209.7 MB
Thomas iMac (disk0s2) / [Startup]: 999.35 GB (697.1 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information: ?
MediaTek Inc MT1887
Mitsumi Electric Apple Optical USB Mouse
Apple Inc. Built-in iSight
Apple, Inc. Keyboard Hub
Apple, Inc Apple Keyboard
Apple Inc. Bluetooth USB Host Controller
Apple Computer, Inc. IR Receiver
Firewire Information: ?
LaCie d2 quadra (button) 800mbit - 800mbit max
S.M.A.R.T. Status: Verified
EFI (disk1s1) <not mounted>: 209.7 MB
Master Back-up (disk1s2) /Volumes/Master Back-up: 999.86 GB (640.35 GB free)
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Mac App Store and identified developers
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[not loaded] com.aliph.driver.jstub (1.1.2 - SDK 10.7) Support
[loaded] com.eltima.SyncMate.kext (0.2.5b15) Support
[loaded] com.sophos.kext.sav (9.0.61 - SDK 10.7) Support
[loaded] com.sophos.nke.swi (9.0.53 - SDK 10.8) Support
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[loaded] com.adobe.fpsaud.plist Support
[loaded] com.google.keystone.daemon.plist Support
[loaded] com.oracle.java.Helper-Tool.plist Support
[loaded] com.oracle.java.JavaUpdateHelper.plist Support
[running] com.sophos.autoupdate.plist Support
[running] com.sophos.configuration.plist Support
[running] com.sophos.intercheck.plist Support
[running] com.sophos.notification.plist Support
[running] com.sophos.scan.plist Support
[running] com.sophos.sxld.plist Support
[running] com.sophos.webd.plist Support
[running] rapiback.plist Support
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[loaded] com.google.keystone.agent.plist Support
[loaded] com.oracle.java.Java-Updater.plist Support
[running] com.sophos.uiserver.plist Support
[running] syncmateStarter.plist Support
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[failed] com.google.GoogleContactSyncAgent.plist Support
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None
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Flip4Mac WMV Plugin: Version: 2.3.8.1 Support
FlashPlayer-10.6: Version: 14.0.0.145 - SDK 10.6 Support
JavaAppletPlugin: Version: Java 7 Update 67 Check version
Flash Player: Version: 14.0.0.145 - SDK 10.6 Outdated! Update
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o1dbrowserplugin: Version: 5.4.2.18903 Support
QuickTime Plugin: Version: 7.7.3
googletalkbrowserplugin: Version: 5.4.2.18903 Support
Silverlight: Version: 4.0.51204.0 Support
iPhotoPhotocast: Version: 7.0
Audio Plug-ins: ?
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins: ?
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes: ?
Flash Player Support
Flip4Mac WMV Support
FUSE for OS X (OSXFUSE) Support
Java Support
MenuMeters Support
Time Machine: ?
Skip System Files: YES - System files not being backed up
Auto backup: YES
Volumes being backed up:
Thomas iMac: Disk size: 930.71 GB Disk used: 281.49 GB
Destinations:
Master Back-up [Local] (Last used)
Total size: 931.19 GB
Total number of backups: 154
Oldest backup: 2011-11-26 04:54:07 +0000
Last backup: 2014-08-19 00:06:13 +0000
Size of backup disk: Adequate
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Time Machine details may not be accurate.
All volumes being backed up may not be listed.
Top Processes by CPU: ?
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      0% sysmond
      0% SophosWebIntelligence
      0% InterCheck
      0% com.apple.WebKit.Networking
Top Processes by Memory: ?
156 MB SophosScanD
143 MB InterCheck
135 MB softwareupdated
98 MB mds_stores
98 MB com.apple.WebKit.WebContent
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1.61 GB Active RAM
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IMac 24-inch 2.4 GHz (circa 2007) freezes, reboots after several hours

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