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It only gets to the part where it gives you the option to "Start windows normally" or "Launch startup repair". If I select either option, it only shows a screen that says "Microsoft Windows" at the bottom center, with a little green bar. And then the computer automatically shuts off. What could be causing this? I haven't been able to get to the Welcome screen for several days.

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possible duplicate of Windows Vista X64 boot freeze on loading splash – Moab May 15 '12 at 0:23
You could be getting a BSOD without realizing it; make sure the BIOS option "Disable automatic restart on system failure" is selected – Nate Koppenhaver May 15 '12 at 3:12

You could have a CPU heat issue. They will shut off if overheating. check that the fans are operating

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