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[ubuntu] Ubuntu 12 Windows 7 UEFI dual boot - blank purple screen

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http://ubuntuforums.org – I got a new laptop (Asus K55A) and I am trying to dual boot ubuntu along with windows 7 (boots into UEFI mode and has GPT partition). I finished installation from a LiveCD. I was able to use ubuntu from LiveCD for most common applications, video/graphics/audio/wireless/touchpad all seemed to work fine. When I start my computer, I see the grub menu with ubuntu and windows option. I am able to start Windows7 from this grub menu (worked after doing boot-repair) but when I select ubuntu it goes into a purple blank screen and remains there until I turn off the power button. What can i do ne (Hardware)