I have used Jake's guide for the Latitude series to install El Capitan on my E7440, followed everything step by step however after booting via UEFI and chosing to install Mac OSX via the usb, the Apple logo shows up and the progress bar starts to move. A couple of seconds later my touchpad becomes active and I can move the mouse around and then suddenly the screen flickers and the Apple logo gets split into four logos, the screen changes to what looks like the OS installation screen but nothing is visible enough, here's a photo just in case - https://goo.gl/photos/tWrgiq3PA42Qwa876
Anyone has any suggestions?