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Mountain Lion Post Install Problem Booting

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So i finally got my pc setup with Mountain Lion with everything working except booting. Well, i installed the bootloader (tired many of them) but my system would still say no operating system found. Then, all of a sudden when I was giving up and reinstalling Win 7 I put the install disk in and turned on my PC. Then the screen came up with the usual press any key to boot from DVD but i didn't do that in time and for some reason it goes to the bootloader & I can boot to OS X! But when i take out the disk I can't boot and it says the no operating system found error again! Please help me i am so close to finishing this setup.


Thank You!


  • Intel Core i3 Processor 2.2GHz
  • 6GB DDR3 RAM
  • (Had this hard drive) 1TB 7200RPM Hard Drive; now i have 500GB western digital 7200RPM
  • 24-Inch Screen, Intel HD Graphics 3000
  • It's an all in one computer by the way, & the computer is a vaio vpcl231fx is that helps
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