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Mathos replied to morpheousman's topic in Installation GuidesHi there, my computer has the following specs Dell optiplex 755 SFF Intel Core2 Quad Q6600@2,4 GHz NVIDIA 9400 GT 4GB RAM Yosemite 10.11.5 This computer have been working great for 2 years. Last week the system disk died, so I lost my yosemite installation disk. I replaced the broken disk with another one and installed yosemite again. Now I have a fresh installation of yosemite working again. But I´ve decided that is time to upgrade to El Capitan/Sierra. Unfortunately, I read that my cpu Q6600 only support S3, so I cannot install Sierra. So I decided to upgrade to El capitan. The BIOS configuration that works with Yosemite is RAID Autodetect/ATA, so I keep the same for el Capitan. I followed the guide from post #1 creating the usb with el capitan and clover. I copied the kext Optiplex 780 (760) El Capitan Clover-v3.zip I tried different optiopns but I always get the error of this picture. Have someone the same model as me ,and share with me your EFI folder, or guided me in the process of installation? Thanks a lot.