I really need help, guys. I updated Clover EFI on my Yosemite partition and it would no longer boot. After tons and tons of test's and running verbose boot mode, I found out it's when I have an external monitor plugged into HDMI is when it loads extra long at the Apple logo, then the external monitor turns a barely lighter black like it's about to show picture, then the computer reboots. I know for sure it's HDMI causing this because I'm writing this booted in from the bootloader on the hard drive without an external monitor plugged in.
Now, before you ask or suggest, I do indeed have the proper kext's enabled and disabled in my config.plist file, but it still continues to do this. I also have my DSDT and SSDT's patched.
I also have a very irritating issue with this partition seeming not to read it's own config.plist, which might be the issue for the HDMI and the issue I'm about to speak of. I'm having an issue where this partition on it's own drive (Yosemite 10.10.5) and El Capitan 10.1 (on separate drive alongside Windows 7) shares the same serial number as the El Capitan partition, based on 'About This Mac', but if you look at this partitions config.plist, the serial is not the same, which obviously I want.
Now, why this is important is because I use a great system-wide EQ and volume booster application in OS X called Boom and when you activate it, it goes by your OS X serial and I only bought a 2 computer license, so you can see how this causes me problems.
Anyone who can help, that would be great. I'm even more bothered by the fact that it shares the same serial number as the other OS. I have no idea how to fix that, but I've fixed issues with the HDMI before, but this time it's bad.
Would also like to note that my sensors for my CPU temperature don't appear to be working after updating to Clover EFI r3277 and installing OS support drivers within HP ProBook Installer Clover 6.4.4.
Attached are some troubleshooting files that may help in finding this issue with my serial or config.plist.
UPDATE: I believe I fixed my HDMI display output by renaming 'AppleIntelSNBGraphicsFB' (the one for VGA patch) differently. I had it named 'disabled:AppleIntelSNBGraphicsFB', but that isn't named differently enough from the other similar named patch for the system to disable it apparently, so I named it 'disabled:AppleIntelSNBGraphFB' so that if I ever wanted to enable it, it'd be obvious that graph meant graphics. Hope this renaming tip helps others. This is the second or third time I've had issues with HDMI display on the count of this patch and not renaming it differently enough.
Now onto my many other issues. haha