[64 bit] Boot problems

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http://ubuntuforums.org – I am encoungtering a weird problem: I have a dual-boot Ubuntu 11/Windows installation, after running fine for 8 months it crashed. Ubuntu refused to reboot. It also refused to boot or re-install from a memory stick (the one I had installed it from in the first place) and from a live CD. I installed a new hard disk and put both Ubuntu and Windows on it. On BOTH disks, and with or without the NVidia GeForce 570 video card I encounter the same problems: Windows boots OK from both hard disks Ubuntu boots from both hard disks only when I choose "recovery mode" and then normal boot. But t (Hardware)