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I believe that I figured out my issue... I was only able to see AHCI, ATA or Legacy in my bios setting because my bois is version A12. I will try to update the bios A22 then reinstall and see what happens.

Understood but my installation would only boot via ATA...when trying to boot from AHCI OR LEGACY the hdd wouldn't show.

I did think before I replied. The bios setting options in a OptiPlex sff 755 are AHCI, ATA and Legacy. I told him to set the bios to ATA... What isn't clear about what I said?

With your USB inserted change the bios setting to ATA then reboot. Once you start the installation process you will be able to see your hard drive and install Yosemite to it... After you will be able to boot from your hard drive but unfoutunatly the usb will still need to be inserted and the...

With your USB inserted change the bios setting to ATA then reboot. Once you start the installation process you will be able to see your hard drive and install Yosemite to it... After you will be able to boot from your hard drive but unfoutunatly the usb will still need to be inserted and the...