IMac won't wake up... but technically it's not sleeping

I leave my computer on all the time. For the last couple of days, when I first get to it in the morning, the screen is dark, but the light is on and not pulsing. The only way I can get it to respond is to power it off and back on. Of course then I get a message that it has unexpectedly restarted and would I like to report it to Apple. When I click on Report, nothing happens. I haven't done anything new except regular updates.

Hi Lisa6352
Welcome to Apple Discussions
When the LED light is on steady, the Computer is awake and only the Display is sleeping! First check your Energy Saver Preference to make sure "Put the computer to sleep when it is inactive for" is set to a desired time. Then also in the Energy Saver Preference, select Options and uncheck the box "Wake for Ethernet network administrator access" There are a number of running processes and connected USB devices that will keep the Computer from sleeping.
Some examples would be:
If any programs like iTunes are left running, then only the Display will auto sleep!
If an iPod, External HD, Flashdrive, Camera or cardreader w/card is left mounted.
If your printer/scanner is left on!
If sharing is setup for network access.
If any USB devices are connected to an incompatible hub.
Question:
With no applications open, your USB devices ejected/disconnected and internet sharing off, do both the Computer and Display sleep it you select sleep from the drop down menu? If not then reset the iMac's SMC carefully following the "How to reset the System Management Controller" in the following link.
http://docs.info.apple.com/article.html?artnum=303446-en
Dennis

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OS X Mavericks: Using the power button
http://support.apple.com/kb/HT5869
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OS X Mavericks: Wake your computer with a wireless mouse or keyboard
http://support.apple.com/kb/PH13997
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http://support.apple.com/kb/TS5357
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Hello,
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press Return on keyboard
set-defaults
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reset-all
press Return
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DALE

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I'm having this same issue. Try this advice
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Interval Since Last Panic Report: 811744 sec
Panics Since Last Report: 1
Anonymous UUID: E61B456B-8CBD-4A83-8A8F-9CB7ACB37245
Thu Oct 22 06:51:41 2009
panic(cpu 0 caller 0x226297): "thread_invoke: preemption_level -1, possible cause: unlocking an unlocked mutex or spinlock"@/SourceCache/xnu/xnu-1456.1.25/osfmk/kern/sched_prim.c:1471
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x8a663c08 : 0x21acfa (0x5ce650 0x8a663c3c 0x223156 0x0)
0x8a663c58 : 0x226297 (0x5864e8 0xffffffff 0x586480 0x225e89)
0x8a663cd8 : 0x22699d (0x1b90a7c4 0x27a317ea 0xff37d30a 0x86)
0x8a663d48 : 0x226a2b (0x486ec5 0x0 0x0 0x29f596)
0x8a663d68 : 0x486ccd (0x486ec5 0x148ab4c8 0x8a663d88 0x29f596)
0x8a663dd8 : 0x493d40 (0x0 0x0 0x493fd4 0x0)
0x8a663ed8 : 0x49459d (0x0 0x1 0x160206b0 0x0)
0x8a663f78 : 0x4ed85f (0x1699a7e0 0x1496ba28 0x16020684 0x1)
0x8a663fc8 : 0x29d3fd (0x1496ba24 0x0 0x10 0x1496ba24)
BSD process name corresponding to current thread: CIJScannerRegist
Mac OS version:
10B504
Kernel version:
Darwin Kernel Version 10.0.0: Fri Jul 31 22:47:34 PDT 2009; root:xnu-1456.1.25~1/RELEASE_I386
System model name: MacPro1,1 (Mac-F4208DC8)
System uptime in nanoseconds: 26766835123168
unloaded kexts:
com.apple.driver.AppleFileSystemDriver 2.0 (addr 0x1076000, size 0x12288) - last unloaded 151268449160
loaded kexts:
com.cisco.nke.ipsec 2.0.1
com.parallels.kext.prl_vnic 4.0 3810.237520
com.parallels.kext.prl_netbridge 4.0 3810.237520
com.parallels.kext.prl_hypervisor 4.0 3810.237520
com.parallels.kext.prlhidhook 4.0 3810.237520
com.parallels.kext.prlusbconnect 4.0 3810.237520
com.Logitech.Control Center.HID Driver 3.1.0
com.apple.filesystems.smbfs 1.6.0 - last loaded 306853089285
com.apple.filesystems.msdosfs 1.6
com.apple.driver.AppleHWSensor 1.9.2d0
com.apple.filesystems.autofs 2.1.0
com.apple.driver.AppleHDA 1.7.4a1
com.apple.driver.AppleUpstreamUserClient 3.0.5
com.apple.DontSteal_Mac_OSX 7.0.0
com.apple.driver.AudioIPCDriver 1.1.0
com.apple.driver.AppleMCEDriver 1.1.9
com.apple.driver.AppleLPC 1.4.6
com.apple.driver.AppleUSBDisplays 2.1
com.apple.GeForce 6.0.2
com.apple.driver.AppleIntelMeromProfile 19
com.apple.driver.ACPISMCPlatformPlugin 3.4.0a20
com.apple.iokit.SCSITaskUserClient 2.5.1
com.apple.BootCache 31
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
com.apple.iokit.IOAHCIBlockStorage 1.5.0
com.apple.driver.AppleFWOHCI 4.3.4
com.apple.driver.AirPortBrcm43xx 410.91.20
com.apple.driver.AppleUSBHub 3.7.8
com.apple.driver.AppleAHCIPort 2.0.0
com.apple.driver.AppleIntel8254XEthernet 2.1.1b7
com.apple.driver.AppleIntelPIIXATA 2.5.0
com.apple.driver.AppleEFINVRAM 1.3.0
com.apple.driver.AppleUSBEHCI 3.7.5
com.apple.driver.AppleUSBUHCI 3.7.5
com.apple.driver.AppleACPIButtons 1.3
com.apple.driver.AppleRTC 1.3
com.apple.driver.AppleHPET 1.4
com.apple.driver.AppleSMBIOS 1.4
com.apple.driver.AppleACPIEC 1.3
com.apple.driver.AppleAPIC 1.4
com.apple.driver.AppleIntelCPUPowerManagementClient 90.0.0
com.apple.security.sandbox 0
com.apple.security.quarantine 0
com.apple.nke.applicationfirewall 2.0.11
com.apple.driver.AppleIntelCPUPowerManagement 90.0.0
com.apple.driver.AppleHIDMouse 1.3.0f1
com.apple.driver.IOBluetoothHIDDriver 2.2.1f7
com.apple.driver.AppleProfileReadCounterAction 17
com.apple.driver.DspFuncLib 1.7.4a1
com.apple.driver.AppleProfileTimestampAction 10
com.apple.driver.AppleProfileThreadInfoAction 14
com.apple.driver.AppleProfileRegisterStateAction 10
com.apple.driver.AppleProfileKEventAction 10
com.apple.driver.AppleProfileCallstackAction 20
com.apple.iokit.IOFireWireIP 2.0.3
com.apple.iokit.IOSurface 73.0
com.apple.iokit.IOBluetoothSerialManager 2.2.1f7
com.apple.iokit.IOSerialFamily 10.0.2
com.apple.iokit.IOAudioFamily 1.7.0fc16
com.apple.kext.OSvKernDSPLib 1.3
com.apple.driver.AppleHDAController 1.7.4a1
com.apple.iokit.IOHDAFamily 1.7.4a1
com.apple.nvidia.nv40hal 6.0.2
com.apple.NVDAResman 6.0.2
com.apple.iokit.IONDRVSupport 2.0
com.apple.iokit.IOGraphicsFamily 2.0
com.apple.iokit.AppleProfileFamily 40
com.apple.driver.AppleSMC 3.0.1d2
com.apple.driver.IOPlatformPluginFamily 3.4.0a20
com.apple.driver.CSRUSBBluetoothHCIController 2.2.1f7
com.apple.driver.AppleUSBMergeNub 3.7.5
com.apple.driver.AppleUSBBluetoothHCIController 2.2.1f7
com.apple.iokit.IOBluetoothFamily 2.2.1f7
com.apple.iokit.IOSCSIBlockCommandsDevice 2.5.1
com.apple.iokit.IOUSBMassStorageClass 2.5.0
com.apple.iokit.IOUSBHIDDriver 3.7.5
com.apple.driver.AppleUSBComposite 3.7.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.5.1
com.apple.iokit.IOBDStorageFamily 1.6
com.apple.iokit.IODVDStorageFamily 1.6
com.apple.iokit.IOCDStorageFamily 1.6
com.apple.driver.XsanFilter 402.1
com.apple.iokit.IOATAPIProtocolTransport 2.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily 2.5.1
com.apple.iokit.IOFireWireFamily 4.1.7
com.apple.iokit.IO80211Family 300.20
com.apple.iokit.IOUSBUserClient 3.7.5
com.apple.iokit.IOAHCIFamily 2.0.0
com.apple.iokit.IONetworkingFamily 1.8
com.apple.iokit.IOATAFamily 2.5.0
com.apple.iokit.IOUSBFamily 3.7.8
com.apple.driver.AppleEFIRuntime 1.3.0
com.apple.iokit.IOHIDFamily 1.6.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.kext.AppleMatch 1.0.0d1
com.apple.security.TMSafetyNet 6
com.apple.driver.DiskImages 281
com.apple.iokit.IOStorageFamily 1.6
com.apple.driver.AppleACPIPlatform 1.3
com.apple.iokit.IOPCIFamily 2.6
com.apple.iokit.IOACPIFamily 1.3.0
Model: MacPro1,1, BootROM MP11.005C.B08, 4 processors, Dual-Core Intel Xeon, 2.66 GHz, 14 GB, SMC 1.7f10
Graphics: NVIDIA GeForce 7300 GT, NVIDIA GeForce 7300 GT, PCIe, 256 MB
Graphics: NVIDIA GeForce 7300 GT, NVIDIA GeForce 7300 GT, PCIe, 256 MB
Memory Module: global_name
AirPort: spairportwireless_card_type_airportextreme (0x14E4, 0x87), Broadcom BCM43xx 1.0 (5.10.91.19)
Bluetooth: Version 2.2.1f7, 2 service, 1 devices, 1 incoming serial ports
Network Service: Parallels Host-Only Networking Adapter, Ethernet, en6
Network Service: Built-in Ethernet 2, Ethernet, en1
Network Service: AirPort, AirPort, en2
Network Service: Parallels Shared Networking Adapter, Ethernet, en5
PCI Card: NVIDIA GeForce 7300 GT, Display, Slot-4
PCI Card: NVIDIA GeForce 7300 GT, Display, Slot-1
Serial ATA Device: ST3250824AS P, 232.89 GB
Serial ATA Device: Maxtor 6Y250M0, 233.76 GB
Serial ATA Device: ST31500341AS, 1.36 TB
Parallel ATA Device: PIONEER DVD-RW DVR-111D
USB Device: Hub, 0x05ac (Apple Inc.), 0x9131, 0xfd400000
USB Device: HP Color LaserJet 2605dn, 0x03f0 (Hewlett Packard), 0x2f17, 0xfd410000
USB Device: ScanSnap S300M, 0x04c5 (Fujitsu Ltd.), 0x117f, 0xfd430000
USB Device: Apple Cinema HD Display, 0x05ac (Apple Inc.), 0x9223, 0xfd420000
USB Device: Hub, 0x05ac (Apple Inc.), 0x911b, 0xfd300000
USB Device: Hub, 0x0409 (NEC Corporation), 0x0059, 0xfd310000
USB Device: Gizmo!, 0x05dc (Lexar Media, Inc.), 0xa720, 0xfd311000
USB Device: USB Receiver, 0x046d (Logitech Inc.), 0xc526, 0xfd312000
USB Device: Macally DotMouse, 0x2222, 0x3075, 0xfd313000
USB Device: Apple Cinema Display, 0x05ac (Apple Inc.), 0x921b, 0xfd320000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8206, 0x5d200000
FireWire Device: built-in_hub, Up to 800 Mb/sec

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IMac won't wake up... but technically it's not sleeping

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