IMac display not recognized

The hard drive started to fail on my daughters mid 2008 Intel 20" iMac A1224. I disassembled and replaced the hard drive. During re-installation of the LCD Display, I inadvertantly pushed a bezel screw through the LCD temperture sensor cable. I didn't realize the cable was damaged until it took apart a second time because of a dark display on restart. I repaired the damaged cable, however there is still no LCD display. All connections on signaI cable and inverter connections appear visually fine. I can display just fine to an external monitor. The first 3 diagnostic lights are all green yet the LCD screen is completely dark. I suspected a damaged inverter but a flashlight test on LCD shows no sign of display working. Since the external display is working, I know the logic board is fine. Could shorting out the LCD temp cable with a screw puncture cause a problem elsewhere? I though this sensor just controlled fan speed. Any suggestions would be greatly appreciated.

Thank you BDAqua. A very close examination of the LVDS cable showed a very small fray. I opened and did a temp repair to verify functionality. The LCD came on as bright as ever. A new LVDS cable is on order. Thank you for helping find the obvious.

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Out of warranty by a month!
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When your plans fail, your Real Story begins!!

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This is from the Service Source:
"Screen is dark, fan is running and the hard drive is spinning. You may hear the startup
chime as well.
1. Reset parameter RAM. Press Command-Option-P-R during startup before “Welcome to Macintosh”
appears.
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Richard

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Hi SultanAshraf,
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iPod shuffle (2nd generation) Troubleshooting Assistant
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IMac display not recognized

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