Puter doesn't want to sleep...

howdy... i have looked at all the obvious things, even restarted it?!? haven't had anything plugged in "that is any different than before" and none of the peripherals are ON trying to keep it awake... so what the frig?!?!
i have NEVER had an issue sleeping my tower... and i have sat here waiting for it to wake, and it doesn't (not immediately)... then later that night or the next day when i go to use it --- it's awake?!?! no one else in the family is using the computer and i moved the chair away so the cats don't get up on the desk and move the mouse...
any ideas? thanks

Same thing here with my G5.
6 years old, never had a problem.
Always kept it updated with any software.
Suddenly, since a few days it keeps waking up from sleep, like 2 or 3 time a day.
The system.log tells me this:
*Jun 17 23:28:33 imac-g5 kernel[0]: System Sleep*
*Jun 17 23:28:33 imac-g5 kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep*
*Jun 17 23:28:33 imac-g5 kernel[0]: System Wake*
*Jun 17 23:28:33 imac-g5 kernel[0]: Wake event 0020*
*Jun 17 23:28:33 imac-g5 lookupd[1088]: lookupd (version 369.8) starting - Thu Jun 17 23:28:33 2010*
*Jun 17 23:28:34 imac-g5 kernel[0]: USB caused wake event (EHCI)*
*Jun 17 23:28:34 imac-g5 kernel[0]: FireWire (OHCI) Apple ID 52 built-in: handleSelfIDInt - received quads == 0. issuing bus reset*
And for each time it is waking up, the log has the exactly same messages than above.
I do not know which of these events is causing the problem.
But for sure the first event talking about waking up is IOBluetoothHCIController
However, my G5 bluetooth is off.
Can somebody make sense of all this ?
Thanks

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    10/13/11 1:50:44.000 AM kernel: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 12 13 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140
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          Status: OK
          Manufacturer: 0x029E
        BANK 1/DIMM0:
          Size: 4 GB
          Speed: 1333 MHz
          Status: OK
          Manufacturer: 0x029E
    SerialATA
       TOSHIBA MK5065GSXF                     
    Diagnostic reports
       2015-03-15 Boom 2 crash
       2015-03-15 com.apple.internetaccounts crash
    Log
       Mar 15 10:26:10 memorystatus_thread: idle exiting pid 546 [tccd]
       Mar 15 10:26:11 memorystatus_thread: idle exiting pid 547 [nsurlstoraged]
       Mar 15 10:26:12 memorystatus_thread: idle exiting pid 544 [soagent]
       Mar 15 10:26:13 memorystatus_thread: idle exiting pid 548 [nsurlstoraged]
       Mar 15 10:26:43 memorystatus_thread: idle exiting pid 556 [com.apple.CodeSi]
       Mar 15 10:26:44 memorystatus_thread: idle exiting pid 558 [accountsd]
       Mar 15 10:26:45 memorystatus_thread: idle exiting pid 553 [com.apple.iCloud]
       Mar 15 10:26:46 memorystatus_thread: idle exiting pid 561 [networkd_privile]
       Mar 15 10:26:47 memorystatus_thread: idle exiting pid 555 [secinitd]
       Mar 15 10:26:48 memorystatus_thread: idle exiting pid 560 [tccd]
       Mar 15 10:26:49 memorystatus_thread: idle exiting pid 562 [secd]
       Mar 15 10:26:50 memorystatus_thread: idle exiting pid 554 [com.apple.intern]
       Mar 15 10:26:51 memorystatus_thread: idle exiting pid 565 [nsurlstoraged]
       Mar 15 10:26:52 memorystatus_thread: idle exiting pid 563 [soagent]
       Mar 15 10:26:53 memorystatus_thread: idle exiting pid 551 [syncdefaultsd]
       Mar 15 10:26:54 memorystatus_thread: idle exiting pid 557 [CoreServicesUIAg]
       Mar 15 10:26:55 memorystatus_thread: idle exiting pid 567 [iconservicesd]
       Mar 15 10:26:56 memorystatus_thread: idle exiting pid 566 [iconservicesagen]
       Mar 15 10:26:57 memorystatus_thread: idle exiting pid 568 [systemstatsd]
       Mar 15 10:26:58 memorystatus_thread: idle exiting pid 550 [cfprefsd]
       Mar 15 10:26:59 memorystatus_thread: idle exiting pid 552 [cfprefsd]
       Mar 15 10:27:00 memorystatus_thread: idle exiting pid 549 [coreduetd]
       Mar 15 10:27:01 memorystatus_thread: idle exiting pid 564 [nsurlstoraged]
       Mar 15 10:28:18 ** GPU Hardware VM is disabled (multispace: disabled, page table updates with DMA: disabled)
       Mar 15 10:29:09 proc 316: load code signature error 4 for file "Boom 2"
    I/O per process: coresymbolicati (UID 0) is using 15 MB/s
    kexts
       com.globaldelight.driver.Boom2Device (1.1)
    Daemons
       com.apple.installer.osmessagetracing
    Agents
       com.apple.AirPortBaseStationAgent
       com.globaldelight.Boom2Daemon
    Extensions
       /Library/Extensions/Boom2Device.kext
       - com.globaldelight.driver.Boom2Device
       /System/Library/Extensions/EPSONUSBPrintClass.kext
       - com.epson.print.kext.USBPrintClass
       /System/Library/Extensions/JMicronATA.kext
       - com.jmicron.JMicronATA
    Applications
       /Applications/Boom 2.app
       - com.globaldelight.Boom2
       /Applications/Boom 2.app/Contents/Library/LoginItems/Boom2Daemon.app
       - null
    Bundles
       /Library/Printers/Canon/BJPrinter/Plugins/BJNP/CIJNetworkIOM.plugin
       - jp.co.Canon.ij.print.iom.CIJNP
       /Library/Printers/Canon/BJPrinter/Plugins/BJNP/CIJNetworkPBM.plugin
       - jp.co.Canon.ij.print.pbm.CIJNP
       /Library/Printers/Canon/BJPrinter/Plugins/BJUSB/BJUSBIOM.plugin
       - jp.co.canon.bj.print.bjusbiom
       /Library/Printers/Canon/BJPrinter/Plugins/BJUSB/BJUSBPBM.plugin
       - jp.co.canon.bj.print.pbm.USB
       /Library/Printers/Canon/BJPrinter/Plugins/BJUSB/CIJUSBClassDriver.plugin
       - jp.co.canon.ij.print.CIJUSBClassDriver
       /Library/Printers/Canon/BJPrinter/Plugins/BJUSB/CIJUSBClassDriver2.plugin
       - jp.co.canon.ij.print.CIJUSBClassDriver2
       /Library/Printers/Canon/BJPrinter/Plugins/IJBluetooth/IJBluetoothIOM.plugin
       - jp.co.canon.ij.print.ijbluetoothiom
       /Library/Printers/EPSON/CIOSupport/CIOHelper.plugin
       - com.epson.print.plugin.CIOHelper
       /Library/Printers/EPSON/CIOSupport/EPSONUSBPrintClass.plugin
       - com.epson.print.plugin.USBPrintClass
       /Library/Printers/EPSON/CIOSupport/XIOP.plugin
       - com.epson.print.plugin.XIOP
       /Library/Printers/EPSON/CIOSupport/XIORemoteClient.plugin
       - com.epson.print.plugin.XIORemoteClient
       /Library/Printers/EPSON/CIOSupport/XIORemoteServer.plugin
       - com.epson.print.plugin.XIORemoteServer
    Restricted files: 219
    Elapsed time (s): 238

    Remove "Boom" and test.
    Any third-party software that doesn't install by drag-and-drop into the Applications folder, and uninstall by drag-and-drop to the Trash, is a system modification.
    Whenever you remove system modifications, they must be removed completely, and the only way to do that is to use the uninstallation tool, if any, provided by the developers, or to follow their instructions. If the software has been incompletely removed, you may have to re-download or even reinstall it in order to finish the job.
    I never install system modifications myself, and except as stated in this comment, I don't know how to uninstall them. You'll have to do your own research to find that information.
    Here are some general guidelines to get you started. Suppose you want to remove something called “BrickMyMac” (a hypothetical example.) First, consult the product's Help menu, if there is one, for instructions. Finding none there, look on the developer's website, say www.brickmymac.com. (That may not be the actual name of the site; if necessary, search the Web for the product name.) If you don’t find anything on the website or in your search, contact the developer. While you're waiting for a response, download BrickMyMac.dmg and open it. There may be an application in there such as “Uninstall BrickMyMac.” If not, open “BrickMyMac.pkg” and look for an Uninstall button. The uninstaller might also be accessed by clicking the Customize button, if there is one.
    Back up all data before making any changes.
    You will generally have to restart the computer in order to complete an uninstallation. Until you do that, there may be no effect, or unpredictable effects.
    If you can’t remove software in any other way, you’ll have to erase and install OS X. Never install any third-party software unless you're sure you know how to uninstall it; otherwise you may create problems that are very hard to solve.
    Trying to remove complex system modifications by hunting for files by name often will not work and may make the problem worse. The same goes for "utilities" such as "AppCleaner" and the like that purport to remove software.

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