Screen turns black while I'm working

My screen turns black, almost like it's going to sleep right when I'm in the middle of typing, searching the web; basically doing anything active...
My screensaver and sleep settings are in the proper positions, so I don't think this should be happening...
hmmm....
any ideas?

Black screens are the curse of the iBooks. Search for "black screen" or screen flickering" to find many others with similar problems. There are a few possible causes, but the most common is probably the reed switch. This is the switch that puts your computer to sleep when you close the lid. Unfortunately, extremely delicate wires + a display hinge opening and closing all the time = crazy problems.
Signs you have a reed switch problem:
- your screen may flicker in brightness randomly.
- it goes black more often when the display angle or laptop is moved.
- after it goes black you can still faintly see the screen, or when you connect an external display it works fine.
- you can put the laptop to sleep and wake it to temporarily bring the display back to life.
To fix the reed switch problem:
- take it back to Apple if you're under warranty. If you can't get the problem to happen at the Genius Bar, tell them about the problems you've been having and insist that they fix it anyway. This is way too common a problem for them to blow you off easily.
- if you're not under warranty, you can pay Apple or some other Mac shop to fix it. I have no idea how much this costs, but probably at least a few hundred.
- if you're not under warranty and you're brave/poor enough that you want to fix it yourself it is possible (I just did it myself last week). While there's nothing about the repair that takes special knowledge, it is a very detailed and arduous process. There are dozens of screws and parts that need to be removed in a very specific sequence. It took me about 5 hours start to finish (though I also replaced the hard drive) and I ended up with a few "extra" pieces that didn't make it back in despite being very careful. On the plus side, the reed switch itself is only about $25 and is available from places like Smalldog.
If you do decide to fix it yourself, do youself a favor and download the guides from ifixit.com. If you google around, you can probably also find the actual Apple repair manual (which is even better), but ifixit.com has great screw guides to keep track of everything.
One last thing - I originally had the reed switch problem under warranty and Apple fixed it with no problem. Unfortunately, the reed switch problem came back in a couple of months - after the warranty expired. Just a word to the wise if you have this problem and you're considering whether to buy the extended AppleCare policy.
iBook G4 800   Mac OS X (10.4.5)   Replaced reed switch and hard drive

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    com.apple.driver.AppleBacklight    170.2.2
    com.apple.driver.AppleMCCSControl    1.0.33
    com.apple.driver.AppleLPC    1.6.0
    com.apple.driver.AGPM    100.12.75
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    com.apple.driver.AudioIPCDriver    1.2.3
    com.apple.driver.ApplePolicyControl    3.1.33
    com.apple.GeForce    7.3.2
    com.apple.driver.ACPI_SMC_PlatformPlugin    5.0.0d8
    com.apple.driver.BroadcomUSBBluetoothHCIController    4.0.8f17
    com.apple.driver.AppleUSBCardReader    3.0.6
    com.apple.driver.AppleIRController    312
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    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
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    com.apple.driver.XsanFilter    404
    com.apple.iokit.IOAHCIBlockStorage    2.1.0
    com.apple.driver.AppleRTC    1.5
    com.apple.driver.AppleFWOHCI    4.9.0
    com.apple.driver.AirPort.Atheros40    505.67.1
    com.apple.driver.AppleAHCIPort    2.3.1
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    com.apple.driver.AppleUSBEHCI    5.1.0
    com.apple.driver.AppleUSBOHCI    5.1.0
    com.apple.driver.AppleEFINVRAM    1.6.1
    com.apple.driver.AppleHPET    1.7
    com.apple.driver.AppleACPIButtons    1.5
    com.apple.driver.AppleSMBIOS    1.9
    com.apple.driver.AppleACPIEC    1.5
    com.apple.driver.AppleAPIC    1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient    195.0.0
    com.apple.nke.applicationfirewall    3.2.30
    com.apple.security.quarantine    1.4
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    com.apple.driver.AppleIntelCPUPowerManagement    195.0.0
    com.apple.driver.AppleMultitouchDriver    231.4
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    com.apple.iokit.IOSurface    80.0.2
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    com.apple.driver.AppleGraphicsControl    3.1.33
    com.apple.driver.AppleHDAController    2.2.5a5
    com.apple.iokit.IOHDAFamily    2.2.5a5
    com.apple.nvidia.nv50hal    7.3.2
    com.apple.NVDAResman    7.3.2
    com.apple.iokit.IONDRVSupport    2.3.4
    com.apple.iokit.IOGraphicsFamily    2.3.4
    com.apple.iokit.IOFireWireIP    2.2.5
    com.apple.driver.IOPlatformPluginLegacy    5.0.0d8
    com.apple.driver.IOPlatformPluginFamily    5.1.1d6
    com.apple.driver.AppleSMC    3.1.3d10
    com.apple.driver.AppleUSBBluetoothHCIController    4.0.8f17
    com.apple.iokit.IOBluetoothFamily    4.0.8f17
    com.apple.iokit.IOSCSIBlockCommandsDevice    3.2.1
    com.apple.iokit.IOUSBMassStorageClass    3.0.3
    com.apple.iokit.IOUSBHIDDriver    5.0.0
    com.apple.driver.AppleUSBMergeNub    5.1.0
    com.apple.driver.AppleUSBComposite    5.0.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.2.1
    com.apple.iokit.IOBDStorageFamily    1.7
    com.apple.iokit.IODVDStorageFamily    1.7.1
    com.apple.iokit.IOCDStorageFamily    1.7.1
    com.apple.iokit.IOSCSIArchitectureModelFamily    3.2.1
    com.apple.iokit.IOFireWireFamily    4.4.8
    com.apple.iokit.IO80211Family    420.3
    com.apple.iokit.IOAHCIFamily    2.0.8
    com.apple.iokit.IONetworkingFamily    2.1
    com.apple.iokit.IOUSBUserClient    5.0.0
    com.apple.iokit.IOUSBFamily    5.1.0
    com.apple.driver.NVSMU    2.2.9
    com.apple.iokit.IOHIDFamily    1.7.1
    com.apple.driver.AppleEFIRuntime    1.6.1
    com.apple.iokit.IOSMBusFamily    1.1
    com.apple.security.sandbox    177.11
    com.apple.kext.AppleMatch    1.0.0d1
    com.apple.driver.DiskImages    331.7
    com.apple.iokit.IOStorageFamily    1.7.2
    com.apple.driver.AppleKeyStore    28.18
    com.apple.driver.AppleACPIPlatform    1.5
    com.apple.iokit.IOPCIFamily    2.7
    com.apple.iokit.IOACPIFamily    1.4
    System Profile:
    Model: iMac10,1, BootROM IM101.00CC.B00, 2 processors, Intel Core 2 Duo, 3.06 GHz, 4 GB, SMC 1.52f9
    Graphics: NVIDIA GeForce 9400, NVIDIA GeForce 9400, PCI, 256 MB
    Memory Module: BANK 0/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334548312D4346382020
    Memory Module: BANK 1/DIMM1, 2 GB, DDR3, 1067 MHz, 0x80CE, 0x4D34373142353637334548312D4346382020
    AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x8F), Atheros 9280: 4.0.67.5-P2P
    Bluetooth: Version 4.0.8f17, 2 service, 18 devices, 1 incoming serial ports
    Serial ATA Device: ST3500418ASQ, 500.11 GB
    Serial ATA Device: HL-DT-ST DVDRW  GA11N
    USB Device: Built-in iSight, apple_vendor_id, 0x8502, 0x24400000 / 2
    USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0x26500000 / 3
    USB Device: USB2.0 Hub, 0x05e3  (Genesys Logic, Inc.), 0x0608, 0x26200000 / 2
    USB Device: IR Receiver, apple_vendor_id, 0x8242, 0x04500000 / 2
    USB Device: Hub in Apple Extended USB Keyboard, apple_vendor_id, 0x1003, 0x06400000 / 3
    USB Device: Apple Extended USB Keyboard, apple_vendor_id, 0x020b, 0x06430000 / 4
    USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x06100000 / 2
    USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8215, 0x06110000 / 6

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