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Hello, Solved, Now I have my Dell Latitude e6420 i5 HD3000 that boot without USB installer. After I have formatted my hard disk with HDD Guru's tool from Windows as you have recommended, I had the same problem as before, when I try to install Clover in the Hard Disk I receive the message "The installation failed" and it boot only with USB installer, as before. I have resolved with an USB-SATA cable, I have removed the hard disk to the laptop and I have connected the Hard Disk to the usb of my iMac with an USB-SATA cable and I have installed Clover in the hard disk without error and now it boot without USB installer. Thank you for your help and your patience to resolved this issue.

Hello, The problem it is in the hard disk. Today I have mounted un old hard disk (80 gb) in the laptop, I have installed again the OS with the same procedure and it boot without USB installer. I don't know what is the cause. Thanks again for your help.

Yes, I have formatted the drive to Guid/Journal Extended as you can see in the picture below.

Helo, Nothing, I have followed your instruction but nothing I received always the same message "The installation failed" my bios already was setting with legacy mode. I do not know what I can do to resolve this problem.

Sorry for the delay to respond, but I am on leave. I have tried various versions the last that I tried it is V2.5 K r5027 Whit attached options. Thank you for your help.

Hello, I have installed High Sierra on my Dell Latitude e6420 i5 HD3000 and it work fine. I have only one problem, it boot only with the installer USB. After installation of High Sierra, when I try to install Clover in the Hard Disk I receive this message "The installation falled". Thank you in advanced for your help to solve this issue.

Owesome! Thanks!!!

Herve', thank you for your reply. Since i don't remember what i installed, can i have a complete list of files i have to gather from the working laptop? Thanks again for all your help!

Good morning, I was finally able to make my Dell E6420 fully working installing, Yosemite and all related drivers. I don't remember how many tries i had to do before the final one. I found out that the laptop i have is a mixed specs of an E6220 and an E6420 so i had to use different kext from different guides in this site and don't know anymore which drivers i used to make ti work. Before i start installing all software needed, i was wondering if there is a way to create a Yosemite install USB starting from the system i just created. In other words, How can i create a USB that will install Yosemite including all drivers that are currently in my working laptop without having to redo the whole procedure from scratch in case the drive crashes? Thank you for your help. Davide