IMac Brightness forgets setting after shut down

Hi, I have an old iMac (not sure what year but it's the white model 24").
Everytime I log in, the brightness setting is always at the lowest setting. At the minute I'm having to change it everytime I go on my mac.
The iMac is running OS X 10.5.8 if that helps at all?
Please help, I've searched for the issue have found nothing so far

Someone had posted this link on another thread:
http://discussions.apple.com/forum.jspa?forumID=881&start=135
So I'm going to try that when I get home. Having Googled and searched these forums it seems I'm not the only one with fan problems, although there seem to be lots of varying issues. I'm now aware that shutting down my computer every night is not necessarily a good thing, but some threads I've read say that the diagnostics that Macs perform in the wee small hours don't get done if the computer is sleeping, either. So what is best? Just leave it turned on? I worry about leaving non-essential electric appliances on all night.
Any help would still be appreciated! Thanks.

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    0xffffff81e08a3c20 : 0xffffff800f065e2f
    0xffffff81e08a3d70 : 0xffffff800ec98c01
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             com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f8f172000->0xffffff7f8f196fff
             com.apple.driver.AppleACPIPlatform(1.7)[D49DC2E0-97DF-32E6-A8ED-7A12EF1AA51B]@0 xffffff7f90fa4000->0xffffff7f90ffbfff
                dependency: com.apple.iokit.IOACPIFamily(1.4)[A35915E8-C1B0-3C0F-81DF-5515BC9002FC]@0xfffff f7f8fe1e000
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f8f172000
             com.apple.iokit.IOGraphicsFamily(2.3.7)[990D1A42-DF16-3AB9-ABC1-6A88AC142244]@0 xffffff7f8f467000->0xffffff7f8f49efff
                dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f8f172000
             com.apple.iokit.IONDRVSupport(2.3.7)[6C8CFC18-75F0-3DEF-86C7-CEB2C1FD6BB1]@0xff ffff7f8f4aa000->0xffffff7f8f4bbfff
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    12E55
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    Kernel UUID: 896CB1E3-AB79-3DF1-B595-549DFFDF3D36
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    System model name: iMac13,1 (Mac-00BE6ED71E35EB86)
    System uptime in nanoseconds: 30955729284596
    last loaded kext at 3449783312757: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f910ab000, size 16384)
    last unloaded kext at 3509845520518: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f910ab000, size 12288)
    loaded kexts:
    com.apple.filesystems.afpfs          10.0
    com.apple.nke.asp_tcp          7.1.0
    com.apple.filesystems.smbfs          1.8.4
    com.apple.driver.AudioAUUC          1.60
    com.apple.driver.AppleBluetoothMultitouch          75.19
    com.apple.driver.AppleHWSensor          1.9.5d0
    com.apple.driver.AGPM          100.12.87
    com.apple.driver.X86PlatformShim          1.0.0
    com.apple.driver.ApplePlatformEnabler          2.0.6d1
    com.apple.driver.AppleMikeyHIDDriver          122
    com.apple.filesystems.autofs          3.0
    com.apple.driver.AppleHDA          2.3.7fc4
    com.apple.GeForce          8.1.2
    com.apple.driver.AppleUpstreamUserClient          3.5.10
    com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.4f2
    com.apple.iokit.IOUserEthernet          1.0.0d1
    com.apple.iokit.IOBluetoothSerialManager          4.1.4f2
    com.apple.driver.AppleSMCLMU          2.0.3d0
    com.apple.driver.AppleLPC          1.6.0
    com.apple.driver.AppleMikeyDriver          2.3.7fc4
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.ApplePolicyControl          3.4.5
    com.apple.driver.AppleIntelHD4000Graphics          8.1.2
    com.apple.driver.AppleMCCSControl          1.1.11
    com.apple.driver.AppleIntelFramebufferCapri          8.1.2
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.BootCache          34
    com.apple.driver.XsanFilter          404
    com.apple.driver.AppleSDXC          1.4.2
    com.apple.iokit.IOAHCIBlockStorage          2.3.1
    com.apple.iokit.AppleBCM5701Ethernet          3.6.1b4
    com.apple.driver.AppleUSBHub          5.5.5
    com.apple.driver.AirPort.Brcm4331          615.20.17
    com.apple.driver.AppleAHCIPort          2.5.2
    com.apple.driver.AppleUSBEHCI          5.5.0
    com.apple.driver.AppleUSBXHCI          5.6.0
    com.apple.driver.AppleEFINVRAM          1.7
    com.apple.driver.AppleACPIButtons          1.7
    com.apple.driver.AppleRTC          1.5
    com.apple.driver.AppleHPET          1.8
    com.apple.driver.AppleSMBIOS          1.9
    com.apple.driver.AppleACPIEC          1.7
    com.apple.driver.AppleAPIC          1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
    com.apple.nke.applicationfirewall          4.0.39
    com.apple.security.quarantine          2.1
    com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
    com.apple.security.SecureRemotePassword          1.0
    com.apple.driver.IOBluetoothHIDDriver          4.1.4f2
    com.apple.driver.AppleMultitouchDriver          235.29
    com.apple.kext.triggers          1.0
    com.apple.driver.DspFuncLib          2.3.7fc4
    com.apple.iokit.IOAudioFamily          1.8.9fc11
    com.apple.kext.OSvKernDSPLib          1.6
    com.apple.nvidia.gk100hal          8.1.2
    com.apple.NVDAResman          8.1.2
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.4f2
    com.apple.iokit.IOSurface          86.0.4
    com.apple.iokit.IOSerialFamily          10.0.6
    com.apple.iokit.IOBluetoothFamily          4.1.4f2
    com.apple.driver.AppleHDAController          2.3.7fc4
    com.apple.iokit.IOHDAFamily          2.3.7fc4
    com.apple.driver.AppleThunderboltEDMSink          1.1.8
    com.apple.driver.AppleThunderboltEDMSource          1.1.8
    com.apple.driver.X86PlatformPlugin          1.0.0
    com.apple.driver.AppleSMC          3.1.4d2
    com.apple.driver.IOPlatformPluginFamily          5.3.0d51
    com.apple.driver.AppleSMBusPCI          1.0.11d0
    com.apple.iokit.IOAcceleratorFamily          74.5.1
    com.apple.driver.AppleGraphicsControl          3.4.5
    com.apple.iokit.IONDRVSupport          2.3.7
    com.apple.driver.AppleSMBusController          1.0.11d0
    com.apple.iokit.IOGraphicsFamily          2.3.7
    com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5
    com.apple.driver.AppleUSBHIDKeyboard          170.2
    com.apple.driver.AppleHIDKeyboard          170.2
    com.apple.iokit.IOUSBHIDDriver          5.2.5
    com.apple.driver.AppleThunderboltDPOutAdapter          1.8.9
    com.apple.driver.AppleThunderboltDPInAdapter          1.8.9
    com.apple.driver.AppleThunderboltDPAdapterFamily          1.8.9
    com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.6
    com.apple.driver.AppleUSBMergeNub          5.5.5
    com.apple.driver.AppleUSBComposite          5.2.5
    com.apple.iokit.IOEthernetAVBController          1.0.2b1
    com.apple.driver.AppleThunderboltNHI          1.7.8
    com.apple.iokit.IOThunderboltFamily          2.4.0
    com.apple.iokit.IO80211Family          530.4
    com.apple.iokit.IONetworkingFamily          3.0
    com.apple.iokit.IOUSBUserClient          5.5.5
    com.apple.iokit.IOAHCIFamily          2.3.1
    com.apple.iokit.IOUSBFamily          5.6.0
    com.apple.driver.AppleEFIRuntime          1.7
    com.apple.iokit.IOHIDFamily          1.8.1
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.sandbox          220.3
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          7
    com.apple.driver.DiskImages          345
    com.apple.iokit.IOStorageFamily          1.8
    com.apple.driver.AppleKeyStore          28.21
    com.apple.driver.AppleACPIPlatform          1.7
    com.apple.iokit.IOPCIFamily          2.7.3
    com.apple.iokit.IOACPIFamily          1.4
    com.apple.kec.corecrypto          1.0
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    Model: iMac13,1, BootROM IM131.010A.B05, 4 processors, Intel Core i5, 2.7 GHz, 16 GB, SMC 2.9f8
    Graphics: NVIDIA GeForce GT 640M, NVIDIA GeForce GT 640M, PCIe, 512 MB
    Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3831554738424255352D474E2D4620
    Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x02FE, 0x45424A3831554738424255352D474E2D4620
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xF4), Broadcom BCM43xx 1.0 (5.106.98.100.17)
    Bluetooth: Version 4.1.4f2 12041, 2 service, 18 devices, 1 incoming serial ports
    Network Service: Ethernet, Ethernet, en0
    Serial ATA Device: APPLE HDD ST1000LM024, 1 TB
    USB Device: hub_device, 0x8087  (Intel Corporation), 0x0024, 0x1a100000 / 2
    USB Device: Keyboard Hub, apple_vendor_id, 0x1006, 0x1a120000 / 4
    USB Device: CTH-470, 0x056a  (WACOM Co., Ltd.), 0x00de, 0x1a123000 / 6
    USB Device: Apple Keyboard, apple_vendor_id, 0x0221, 0x1a122000 / 5
    USB Device: FaceTime HD Camera (Built-in), apple_vendor_id, 0x8511, 0x1a110000 / 3
    USB Device: hub_device, 0x8087  (Intel Corporation), 0x0024, 0x1d100000 / 2
    USB Device: hub_device, 0x0424  (SMSC), 0x2412, 0x1d180000 / 3
    USB Device: BRCM20702 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x1d181000 / 4
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x828b, 0x1d181300 / 5

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    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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