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Hey I'm start by saying a lot of the info if not all is already on here scattered... Im just make a write up quick to show u what is needed.. Dell Optiplex 745 q6700 8gb ram hd5450 512mb ssd 120 gb Yo need MACPWN and Yosemite app and a working mac or the same one with a previous version.. Make the USB be PATIENT!!!! it took about 30 minutes to complete and the status didn't move much ... once done u need kext utility and IOATA kext ver 2.5.1 and insert that to S/L/E of usb installer then rebuild permmison now set up ur bios as follows disket usb sata only leave the one with the hdd ur going to us turn off the rest then put it in legacy mode.. now boot off the usb and install OS X yosemite after install use kext uftilitys to put in all the kext from the usb installing in the EFI folder and add in your network kext and sound kext all to S/L/E and rebuild then go to disk utility and resize you partition make a 1gb partition ms dos format now install clover to the 1gb partition u can add themes now and u don't need to check everything off and then you r good just reboot and u will be booting from your hard drive now you can fix ur setup and may sure ur mac is on SATA 0 you should be good to go also u need to add graphic but that easy u can find the hd5450 kext or wtvr one u use and put the kext in S/L/E ad rebuild