I just found out that I have Intel 5500, so I'm using the method here: http://www.tonycrapx86.com/yosemite-laptop-support/162062-guide-intel-hd-graphics-5500-os-x-yosemite-10-10-3-a.html
Still no luck. I'm using the clover inject method.
So I used the files from post #19 and the files from post #20 and either one allows me to boot to the clover boot screen but after I select the Yosemite USB I get a circle with a line thru it.
Yea I can't even get to that. At first I could navigate thru the file structure but I selected the wrong efi file. Ever since then I can't even see the usb now. I'm trying a different usb drive now.
Also, should I be using usb 2.0? Or will 3 work?
I followed 1-4 of this guide and at one point I had the USB drive listed in the UEFI boot area of the BIOS but now it's gone. Not even listed when I go back to Legacy boot. Any ideas?