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@matty9119, here's the my snap of my mainscreen, all thanks to you!!! The only problem I need to figure out is the weird behaviour of my screen shutting off at the login screen, if I run on battery. The battery seems to work fine on windows! Update: ML seems to work fine in safe boot( -x...

If I don't use a power supply, the display shuts off once I reach the login screen but I can see the keyboard back-light on and the motherboard fans running....I just did a re-install again along with the updated DSDT & kexts. Still facing the same issue. ML works normally if I boot using the...

VoodooHDA-v2.7.4.pkg did work for me, although I had to re-install everything again as I had a kernel panic when I installed it the first time. I'm facing a weird problem in a way that, ML will only boot if I connect my charger cable. If I switch the power adapter off, my display goes blank...

My homescreen....

@matty9119, Thnx for the guide... I was able to successfully install ML on my machine, all thanks to your guide!!! However, after the ML installation, when I boot again, the installer asks for net connectivity options and I see that WiFi is disabled. Also the LVDS is working now, again...

Sorry for the additional post.

I too have a Dell XPS similar model with i7 720QM and ATI HD 4670. I'm planning to buy Mountain Lion 10.8 for this configuration. Before I go with the purchase, I wanted to know if ATI 4670 supports QE/CI. The last time I installed Snow Leopard 10.6.2 on my machine, I was left with a...