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Mountain Lion no video signal/black screen

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Hi. I have a Dell Precision T5500 on which I installed osx 10.8 niresh12495 release. After finishing installation it did a reboot and after the boot logo the screen goes black and has no signal like the video card is not giving any signal, but the hdd is still working like it still does the booting. My configuration is: quad core x5570 cpu, 4GB ram, Nvidia quadro fx1800. I put the full specs in attachment. Can anyone tell me what could be the problem please. Thank you

Dell T5500.txt.zip

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