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Mavericks/Mountain Lion Boot Issue PLEASE HELP

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Hey Guys,
Ive installed and completed both Mavericks and Mountain lions installation but after i reboot and get to the boot menu all i see is the usb that i used for the installation. there is not boot option for the hardrive i just installed the OS to, i named the partition that i made Mountain Lion and Mavericks for each depending on which i was doing, so i dont think i messed up there. I tried both of the OSs to see if i would get a different outcome. so i don't think that's the issue please reply with the resolution.

PS. I used unibeast for the installation

Thanks Andrew,
 
no help without your hardware and bios settings!
 
have you changed any bios settings and what did you change?
 
also here are the bios settings,
 

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iv turned off secure boot, turned on fast bios mode and set ahci to enabled, I really appreciate your help.
 
make AHCI mode to Auto or Enabled and change OS mode Selection to CSM and then give it a try
 
also disable fast boot also
 
Alright, its currently installing. Ill get back to you when its done.
 
what did you format your osx drive to?
 
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