[SOLVED] ubuntu won't start after installation

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http://ubuntuforums.org – I try install ubuntu in my Acer Aspire 5750g. since ubuntu can't be installed at the first time, so I set the boot option as acpi=off as other people said, which it did work. after I finished installation and restart my computer, I enter grub menu and start the ubuntu, however the computer become black screen. I tried several time but I still couldn't get over this problem. now I delete ubuntu but I got the boot-repair info and hope someone can help me. Thank you very much! here is link to boot-repair info: http://paste.ubuntu.com/5631053/ (Hardware)