White Screen 20" iMac a1224, chimes, boots, screen dims after a while. When mirrored on external display seems fine. Any thoughts?

Title says it all. 20" iMac a1224 when I start it up it chimes and seems to boot wireless keyboard connected to it and makes noises, wired mouse. Connected display to it and randomly clicked and dragged until I pulled preferences over to external display and set to mirrored. everything "seems" to functioning fine besides built in screen. Not sure what other tests to do, any input would be great.

OK here is an update.
iMac 20" 2 GHz Intel Core 2 duo, 2GB 667 MHz ddr2 sdram    serial number - W873688AX85
I replaced the harddrive - WD caviar blue 500gb SATA III 7200rpm 16mb cache WD5000AAKX
Installed Mountain Lion 10.8.5 with the iMac display disconnected, (the plug directly to the right of the wireless card), and connected to external display. One partition.
Did all of the current updates
Powered off, disconnected power cord, connected internal display, rebooted - still white screen with extended desktop on external display
Read something about the four green LEDs. With the internal display connected, the fourth LED from the left with the LEDs being on the left of the RAM slot, is on. This LED does not come on when the internal display is disconnected.
From here I just dont know if its the display or the loic board. Are there any tests I can do to narrow it down?
I saw that the G5 had problems with capacitors, can this be similar?
Thanks

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    com.apple.iokit.IONDRVSupport 2.4.1
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    com.apple.driver.AppleThunderboltDPInAdapter 3.1.7
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    com.apple.driver.AppleThunderboltPCIDownAdapter 1.4.5
    com.apple.driver.AppleUSBMultitouch 240.9
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    iPhone User Guide
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  • IMac won't boot windows 7 after ram increase to 12gb

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    Fixed the problem with this setup
    Of course this means i just lost 4GB.
    Let me tell the full story.
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  • IMac is not booting - How can I copy my files to an external drive

    Hello,
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    My TimeMachine backup was not working, so I have no actual backup and need to find a solution to copy my files to an external drive.
    Instead of Data Rescue 3, I can use TechTools Pro 6 alternatively.
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    What I found out so far, it looks like a corrupted file system.
    Have anyone an idea or a tip, how I can copy my files?
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    The internal drive is failing, or has failed. You may not be able to save the data.
    There are several ways to back up a Mac that is unable to fully boot. You need an external hard drive to hold the backup data.
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    2. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire or Thunderbolt cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
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    Start your system with the original install disk and then go to disk utility. Do a Repair disk, if that works do a Repair permissions. Then if all that is good reboot normally and do a Combo update to 10.6.8
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