IMac goes to sleep unexpectedly, Finder issues with flash drives - related?

My iMac falls asleep for no known reason, often in the middle of active use. (Similar problem recently described in thread with messageID=11829917.)
Sleep onset is frequent but seems to vary based on both currently-running software and attached devices (particularly USB flash drives). It will almost always wake up when I hit the space bar afterward, but might sleep again within a minute or two, then not for an hour or more. The sleep occurs with little notice (brief stall of display, sometimes enough time to click on another app window and bring that forward before the screen goes dark), and 95% of the time the computer wakes up after hitting the spacebar. The other 5 % of the time the display reappears but the entire OS is frozen and usually requires unplugging the power cable. There are other symptoms in the Finder - more below. Once in a while the fan revs up like a WWII fighter plane taking off from a carrier, but this is unusual and all the really irritating stuff also happens without this symptom, which usually stops on its own. Immediately after reawakening error messages are displayed to report that flash drives were improperly disconnected (Tell me about it! This has been the case for several months whether the computer goes to sleep by itself or if I put it there manually.)
The computer seems to go into sleep mode most frequently when not-particularly-demanding graphics (Photoshop Elements and Adobe Reader) and video (QuickTime Pro 7.6.4) apps are running. Turning these off makes nod-offs less frequent but doesn't stop it entirely. When video thumbnails are displayed in Finder windows a lot of time may be required to load the data and this often paralyzes everything else AND this also seems to be a trigger for a nod-off (i.e. QuickTime not necessary to make the computer choke). This is highly variable and some video clips load quickly (< 20 sec), while others take several minutes, and this doesn't necessarily correlate with file size.
Another factor is whether flash drives are connected - these seem to make the nod-offs more frequent AND Finder regularly loses communication to these both while just sitting there and also in the middle of file transfers. A very early 250 MB drive (Lexar - vintage 2004) will always communicate, but different USB2-capable drives all are either unreliable (Lexar 8 GB and KData 4 GB both < 1 yr old) or apparently dead (Lexar 2 GB ~ 2 yr old). The failures may be damaging the drives - they are inconsistent-to-bad at communicating with my MacBook Pro. I know this sounds like the drives are at fault, but there are things which make me suspect the OS (both computers use the same version): 1) different flash drives display the same on-again-off-again behavior AND the 2) the 2 GB drive that hasn't communicated with my Macs in over a month has no trouble talking with my wife's WinXP computer. When communication isn't working with these drives, they do not show up in either Finder or Disk Utility. When the Mac-dead 2 GB Lexar is plugged into either computer and I launch Disk Utility, the initial scan for drives never finishes so I have to force quit. (When they are working, on the iMac the large drives only appear in Finder if I go to User and press Command-uparrow (to go up a directory layer) - in columns display mode nothing appears in the left-hand column.
(The following describes a set of problems I've had a little longer and which may or may not be related):
At times the Finder loses some but not all functions:
1) Sometimes files in the Trash can't be ejected* even when all apps are turned off
2) usually when problem 1) is observed, no keyboard commands work: nothing happens when pressing Command-W, Command-uparrow or Command-N to open a new window. Text typed will not be entered to change filenames (but this can still be done by typing the desired text in TextEdit, copying there and selecting and pasting with mouse commands.)
<* I have downloaded an app for forcing file deletion, but haven't really needed it - the delete option and keyboard commands all return after shutdown and reboot, and there's usually enough annoying stuff going on by this time that that seems the best thing to do.>
Things which I've tried to fix it with so far (not in this order):
- blowing dust out of the back with canned air
- checking temperatures - CPU/GPU showing 72/73, HD bay 51, etc.
- fixing permissions from normal boot
- boot from install disk and running extended hardware test (no problems found during scans repeated several times during the past month)
- fixing permissions and running Disk First Aid from install disk boot
- getting files off the hard drive (was as low as 3 GB free space, currently ~ 35 GB and climbing)
- clearing PRAM
- resetting system manager (name? - hold down power button when reconnecting power cable, etc.)
- Power Saver display and computer auto sleep are shut off (both on "never" - I regularly put it to sleep manually)
- virus scans (Clam XAV)
I realize that this is a kitchen sink collection of symptoms, but these things may be related and if so, OS developers may want to be sure these problems are avoided in current versions. (Yes I will upgrade my OS soon...)

Thanks for checking in, Miriam - sorry to get testy about it.
The iMac's RAM is maxed out (2.5 GB)
Yes, the system log does report overtemp message to Power management prior to shutdown (today's log at end of post)
Where do I find normal temperatures for the system? What are the important parameters to watch and what sort of fixes are possible?
iStat currently shows:
HD 54° CPU 67° GPU 72° Incoming air 38° (???)
HD bay 54° GPU ambient 71° opt drive 49°
==========================================
Console.log was largely full of stuff about a bad flash drive I stuck in as a Hail Mary and failure of communication with a scanner (old HP, driver package installs a program which starts at launch which doesn't show up under Startup Items. Apparently the permission got mislaid, so I fixed permissions and this seems OK now. (Only included that because some of it shows up in System.log and it's not worth focusing on.)
[That all said, there is a software/OS component to the problem and it is graphics-related. The other night I was looking at some flash videos in a series and one in particular repeatedly caused shutdown, while others played normally: domain = jebhost.com /youtube/list.php?q=Henry+8.o&Submit=GO "The Tricycle Thief" only played through once out of about six tries.]
=========================================
System Log Aug 1 (last addition 20 minutes ago)
Aug 1 14:52:46 gerda-kilgores-imac-g5 cp: error processing extended attributes: Operation not permitted
Aug 1 17:07:42 gerda-kilgores-imac-g5 cp: error processing extended attributes: Operation not permitted
Aug 1 17:23:51 gerda-kilgores-imac-g5 kernel[0]: comlexar_driverLexarFilterScheme[0x2b6e3000]::init(0x46c34c0)
Aug 1 17:23:51 gerda-kilgores-imac-g5 kernel[0]: comlexar_driverLexarFilterScheme[0x2b6e3000]::free()
Aug 1 17:24:07 gerda-kilgores-imac-g5 kernel[0]: comlexar_driverLexarFilterScheme[0x2b6e3000]::init(0x3827ec0)
Aug 1 17:24:07 gerda-kilgores-imac-g5 kernel[0]: comlexar_driverLexarFilterScheme[0x2b6e3000]::free()
Aug 1 17:38:33 gerda-kilgores-imac-g5 kernel[0]: disk1s1: I/O error.
Aug 1 17:38:33 gerda-kilgores-imac-g5 diskarbitrationd[40]: unable to repair /dev/disk1s1 (status code 0x00000008).
Aug 1 17:38:41 gerda-kilgores-imac-g5 kernel[0]: USBF: 31965.839 AppleUSBEHCI[0x360e800]::Found a transaction which hasn't moved in 5 seconds on bus 75, timing out!
Aug 1 17:38:42 gerda-kilgores-imac-g5 kernel[0]: USBF: 31966.868 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing getting port status (4)
Aug 1 17:38:42 gerda-kilgores-imac-g5 kernel[0]: USBF: 31966.901 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing clearing port feature
Aug 1 17:38:42 gerda-kilgores-imac-g5 kernel[0]: USBF: 31967. 23 ControlTransaction: control packet 1 error 0xe0004057
Aug 1 17:38:49 gerda-kilgores-imac-g5 kernel[0]: USBF: 31973.868 AppleUSBEHCI[0x360e800]::Found a transaction which hasn't moved in 5 seconds on bus 75, timing out!
Aug 1 17:38:53 gerda-kilgores-imac-g5 kernel[0]: USBF: 31977.938 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing getting port status (4)
Aug 1 17:38:53 gerda-kilgores-imac-g5 kernel[0]: USBF: 31978. 2 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing clearing port feature
Aug 1 17:38:56 gerda-kilgores-imac-g5 kernel[0]: USBF: 31981.506 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing getting port status (4)
Aug 1 17:38:56 gerda-kilgores-imac-g5 kernel[0]: USBF: 31981.571 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing clearing port feature
Aug 1 17:38:59 gerda-kilgores-imac-g5 kernel[0]: USBF: 31984.264 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing getting port status (4)
Aug 1 17:38:59 gerda-kilgores-imac-g5 kernel[0]: USBF: 31984.329 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing clearing port feature
Aug 1 17:39:01 gerda-kilgores-imac-g5 kernel[0]: USBF: 31986. 31 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing getting port status (4)
Aug 1 17:39:01 gerda-kilgores-imac-g5 kernel[0]: USBF: 31986. 64 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing clearing port feature
Aug 1 17:39:01 gerda-kilgores-imac-g5 kernel[0]: USBF: 31986.187 ControlTransaction: control packet 1 error 0xe0004057
Aug 1 17:39:02 gerda-kilgores-imac-g5 kernel[0]: USBF: 31987.712 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing getting port status (4)
Aug 1 17:39:02 gerda-kilgores-imac-g5 kernel[0]: USBF: 31987.774 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing clearing port feature
Aug 1 17:39:03 gerda-kilgores-imac-g5 kernel[0]: USBF: 31988.139 IOUSBCompositeDriver[0x46bea00](HP Scanjet 5400C Series) GetFullConfigDescriptor(0) returned NULL
Aug 1 17:39:04 gerda-kilgores-imac-g5 kernel[0]: USBF: 31989. 55 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing getting port status (4)
Aug 1 17:39:04 gerda-kilgores-imac-g5 kernel[0]: USBF: 31989.178 AppleUSBHubPort: Port 2 of Hub at 0x4b240000 reported error 0xe00002ed while doing clearing port feature
Aug 1 17:39:04 gerda-kilgores-imac-g5 kernel[0]: USBF: 31989.204 ControlTransaction: control packet 1 error 0xe0004057
Aug 1 17:39:04 gerda-kilgores-imac-g5 kernel[0]: USBF: 31989.479 IOUSBCompositeDriver[0x46bec00](HP Scanjet 5400C Series) GetFullConfigDescriptor(0) returned NULL
Aug 1 17:39:05 gerda-kilgores-imac-g5 kernel[0]: USBF: 31990.455 ControlTransaction: control packet 1 error 0xe0004057
Aug 1 17:39:05 gerda-kilgores-imac-g5 kernel[0]: USBF: 31990.503 IOUSBCompositeDriver[0x36cb380](HP Scanjet 5400C Series) GetFullConfigDescriptor(0) returned NULL
Aug 1 17:49:08 localhost kernel[0]: standard timeslicing quantum is 10000 us
Aug 1 17:49:08 localhost lookupd[43]: lookupd (version 369.8) starting - Sun Aug 1 17:49:08 2010
Aug 1 17:49:08 localhost kernel[0]: vmpagebootstrap: 633665 free pages
Aug 1 17:49:08 localhost memberd[41]: memberd starting up
Aug 1 17:49:08 localhost kernel[0]: migtable_maxdispl = 70
Aug 1 17:49:08 localhost kernel[0]: 92 prelinked modules
Aug 1 17:49:08 localhost kernel[0]: Copyright (c) 1982, 1986, 1989, 1991, 1993
Aug 1 17:49:08 localhost kernel[0]: The Regents of the University of California. All rights reserved.
Aug 1 17:49:08 localhost kernel[0]: using 6553 buffer headers and 4096 cluster IO buffer headers
Aug 1 17:49:08 localhost kernel[0]: AppleKauaiATA shasta-ata features enabled
Aug 1 17:49:08 localhost kernel[0]: DART enabled
Aug 1 17:49:08 localhost kernel[0]: USB caused wake event (EHCI)
Aug 1 17:49:08 localhost kernel[0]: FireWire (OHCI) Apple ID 52 built-in now active, GUID 001451ff fe261dcc; max speed s400.
Aug 1 17:49:08 localhost kernel[0]: CSRHIDTransitionDriver::probe:
Aug 1 17:49:08 localhost kernel[0]: CSRHIDTransitionDriver::start before command
Aug 1 17:49:08 localhost kernel[0]: Security auditing service present
Aug 1 17:49:08 localhost kernel[0]: BSM auditing present
Aug 1 17:49:08 localhost kernel[0]: disabled
Aug 1 17:49:08 localhost kernel[0]: rooting via boot-uuid from /chosen: D5C0BAB6-ADB2-3A2A-9DDD-6F971A163F6B
Aug 1 17:49:08 localhost kernel[0]: Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
Aug 1 17:49:08 localhost kernel[0]: Got boot device = IOService:/MacRISC4PE/ht@0,f2000000/AppleMacRiscHT/pci@3/IOPCI2PCIBridge/k2-sat a-root@C/AppleK2SATARoot/k2-sata@0/AppleK2SATA/ATADeviceNub@0/IOATABlockStorageD river/IOATABlockStorageDevice/IOBlockStorageDriver/WDC WD2500JS-40MVB1 Media/IOApplePartitionScheme/Untitled 3@3
Aug 1 17:49:08 localhost kernel[0]: BSD root: disk0s3, major 14, minor 2
Aug 1 17:49:08 localhost kernel[0]: jnl: replay_journal: from: 2051072 to: 8100352 (joffset 0xa701000)
Aug 1 17:49:08 localhost kernel[0]: CSRHIDTransitionDriver::stop
Aug 1 17:49:08 localhost kernel[0]: AppleSMU -- shutdown cause = 3
Aug 1 17:49:08 localhost kernel[0]: AppleSMU::PMU vers = 0x000d0092, SPU vers = 0x56, SDB vers = 0x01,
Aug 1 17:49:08 localhost kernel[0]: IOBluetoothHCIController::start Idle Timer Stopped
Aug 1 17:49:08 localhost kernel[0]: HFS: Removed 2 orphaned unlinked files
Aug 1 17:49:08 localhost kernel[0]: Jettisoning kernel linker.
Aug 1 17:49:08 localhost kernel[0]: Resetting IOCatalogue.
Aug 1 17:49:08 localhost kernel[0]: Matching service count = 0
Aug 1 17:49:08 localhost kernel[0]: Matching service count = 2
Aug 1 17:49:08 localhost kernel[0]: Matching service count = 2
Aug 1 17:49:08 localhost kernel[0]: Matching service count = 2
Aug 1 17:49:08 localhost kernel[0]: Matching service count = 2
Aug 1 17:49:08 localhost mDNSResponder-108.6 (Jul 19 2007 11: 33:32)[33]: starting
Aug 1 17:49:08 localhost kernel[0]: Matching service count = 2
Aug 1 17:49:08 localhost kernel[0]: SMUNeo2PlatformPlugin::initThermalProfile - entry
Aug 1 17:49:08 localhost kernel[0]: SMUNeo2PlatformPlugin::initThermalProfile - calling adjust
Aug 1 17:49:08 localhost kernel[0]: IPv6 packet filtering initialized, default to accept, logging disabled
Aug 1 17:49:08 localhost DirectoryService[46]: Launched version 2.1 (v353.6)
Aug 1 17:49:09 localhost kernel[0]: UniNEnet: Ethernet address 00:14:51:26:1d:cc
Aug 1 17:49:09 localhost diskarbitrationd[40]: disk0s3 hfs D5C0BAB6-ADB2-3A2A-9DDD-6F971A163F6B HiMac /
Aug 1 17:49:09 localhost kernel[0]: AirPortPCI_MM: Ethernet address 00:14:51:7e:85:c0
Aug 1 17:49:09 localhost launchd: Server 3507 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[43]: exited abnormally: Hangup
Aug 1 17:49:10 localhost usbmuxd[36]: usbmuxd-196 built for iTunesNineTwo on May 17 2010 at 13:53:51, running 32 bit
Aug 1 17:49:10 localhost lookupd[63]: lookupd (version 369.8) starting - Sun Aug 1 17:49:10 2010
Aug 1 17:49:10 localhost configd[38]: WirelessConfigure: 88001003
Aug 1 17:49:10 localhost configd[38]: initCardWithStoredPrefs failed.
Aug 1 17:49:10 localhost configd[38]: WirelessConfigure: 88001003
Aug 1 17:49:11 localhost kernel[0]: Registering For 802.11 Events
Aug 1 17:49:11 localhost kernel[0]: [HCIController][setupHardware] AFH Is Supported
Aug 1 17:49:12 localhost mDNSResponder: Adding browse domain local.
Aug 1 17:49:13 localhost kernel[0]: ATY,Aphrodite2_A: vram [98000000:08000000]
Aug 1 17:49:13 localhost kernel[0]: ATY,Aphrodite2_B: vram [98000000:08000000]
Aug 1 17:49:13 localhost /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow: Login Window Application Started
Aug 1 17:49:14 localhost loginwindow[67]: Login Window Started Security Agent
Aug 1 17:49:18 gerda-kilgores-imac-g5 configd[38]: setting hostname to "gerda-kilgores-imac-g5.local"
Aug 1 17:49:20 gerda-kilgores-imac-g5 kernel[0]: AirPort: Link Active: "U2M67" - 001801fb71c5 - chan 11
Aug 1 17:49:20 gerda-kilgores-imac-g5 configd[38]: AppleTalk startup
Aug 1 17:49:23 gerda-kilgores-imac-g5 configd[38]: executing /System/Library/SystemConfiguration/Kicker.bundle/Contents/Resources/enable-net work
Aug 1 17:49:23 gerda-kilgores-imac-g5 configd[38]: posting notification com.apple.system.config.network_change
Aug 1 17:49:23 gerda-kilgores-imac-g5 launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[63]: exited abnormally: Hangup
Aug 1 17:49:23 gerda-kilgores-imac-g5 lookupd[119]: lookupd (version 369.8) starting - Sun Aug 1 17:49:23 2010
Aug 1 17:49:23 gerda-kilgores-imac-g5 configd[38]: setting hostname to "new-host.home"
Aug 1 17:49:26 gerda-kilgores-imac-g5 configd[38]: target=enable-network: disabled
Aug 1 17:49:27 gerda-kilgores-imac-g5 configd[38]: AppleTalk startup complete
Aug 1 17:49:29 gerda-kilgores-imac-g5 mDNSResponder: NOTE: Wide-Area Service Discovery disabled to avoid crashing defective DNS relay 192.168.1.1.
Aug 1 18:18:49 gerda-kilgores-imac-g5 kernel[0]: comlexar_driverLexarFilterScheme[0x2b609000]::init(0x3587f00)
Aug 1 18:18:49 gerda-kilgores-imac-g5 kernel[0]: comlexar_driverLexarFilterScheme[0x2b609000]::free()
Aug 1 18:28:19 gerda-kilgores-imac-g5 kernel[0]: IOSMUPwrController:: OverTemp notification
Aug 1 18:28:19 gerda-kilgores-imac-g5 kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
Aug 1 18:28:21 gerda-kilgores-imac-g5 kernel[0]: AirPort: Link DOWN (Client disAssoc 0)
Aug 1 18:28:21 gerda-kilgores-imac-g5 launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[119]: exited abnormally: Hangup
Aug 1 18:28:21 gerda-kilgores-imac-g5 configd[38]: posting notification com.apple.system.config.network_change
Aug 1 18:28:21 gerda-kilgores-imac-g5 configd[38]: setting hostname to "gerda-kilgores-imac-g5.local"
Aug 1 18:28:21 gerda-kilgores-imac-g5 configd[38]: AppleTalk shutdown
Aug 1 18:28:21 gerda-kilgores-imac-g5 configd[38]: AppleTalk shutdown complete
Aug 1 18:28:21 gerda-kilgores-imac-g5 /usr/sbin/AppleFileServer: AFPServer::AbnormalATListenerShutDown - clear listener
Aug 1 18:28:21 gerda-kilgores-imac-g5 lookupd[240]: lookupd (version 369.8) starting - Sun Aug 1 18:28:21 2010
Aug 1 18:28:25 gerda-kilgores-imac-g5 kernel[0]: System Sleep
Aug 1 18:28:25 gerda-kilgores-imac-g5 kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep
Aug 1 18:28:25 gerda-kilgores-imac-g5 kernel[0]: System Wake
Aug 1 18:28:25 gerda-kilgores-imac-g5 kernel[0]: Wake event 0020
Aug 1 18:28:25 gerda-kilgores-imac-g5 kernel[0]: USB caused wake event (EHCI)
Aug 1 18:28:26 gerda-kilgores-imac-g5 kernel[0]: FireWire (OHCI) Apple ID 52 built-in: handleSelfIDInt - received quads == 0. issuing bus reset
Aug 1 18:28:32 gerda-kilgores-imac-g5 kernel[0]: AirPort: Link Active: "U2M67" - 001801fb71c5 - chan 11
Aug 1 18:28:32 gerda-kilgores-imac-g5 configd[38]: AppleTalk startup
Aug 1 18:28:35 gerda-kilgores-imac-g5 launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[240]: exited abnormally: Hangup
Aug 1 18:28:35 gerda-kilgores-imac-g5 configd[38]: posting notification com.apple.system.config.network_change
Aug 1 18:28:35 gerda-kilgores-imac-g5 lookupd[249]: lookupd (version 369.8) starting - Sun Aug 1 18:28:35 2010
Aug 1 18:28:36 gerda-kilgores-imac-g5 configd[38]: setting hostname to "new-host.home"
Aug 1 18:28:37 gerda-kilgores-imac-g5 mDNSResponder: Repeated transitions for interface en1 (192.168.1.2); delaying packets by 5 seconds
Aug 1 18:28:38 gerda-kilgores-imac-g5 configd[38]: AppleTalk startup complete
Aug 1 18:28:41 gerda-kilgores-imac-g5 mDNSResponder: NOTE: Wide-Area Service Discovery disabled to avoid crashing defective DNS relay 192.168.1.1.

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    Try resetting the SMC 2-3 times, if that does not work then the DVD may need cleaning. Get a dry cleaning kit from your local office supply store.
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    Just to follow up with this for anyone has a similar problem.
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    Hi,
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    Based on some searching and testing, it seems that if you redirect ~/Library/Application Support/Adobe/Flash CS5 to a location on the local hard drive, rather than the network account storage, the problem ceases.
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    Take care,
    Branden

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