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OK, I did exactly as instructed and I get a "Can't find mach_kernel" when I choose the USB stick at boot up.
I should mention that I set this up years ago with a triple boot up. I can't remember how I did it. I partitioned the hard drive into equal thirds. 1. Snow Leopard 2. Snow Leopard B/U (a copy of the first install) 3. Windows 10
There is an ascending bar at boot up that allows me to chose what OS to boot before defaulting to Snow Leopard. After erasing the Snow Leopard B/U to accept the New El Capitan install, the option to boot the B/U is gone. All that remains is; Snow Leopard, Windows 10 and the USB stick with El Capitan. I have boot from USB first set up in the BIOS but it still goes to the boot option screen. (not sure if that is relevant)
 
I recommended a clean SSD to install El Capitan onto.. If you don't have one you could buy one or use a used HDD that you may have and format it before installing. Your old 3 partition drive used Chimera bootloader and your new El Capitan install uses Clover bootloader only. Chimera doesn't work with El Cap or Sierra. So do not try and install El Cap on your current drive with SL and Win10. You'll need to start with a different drive. Disconnect your current 3 part HDD before you do the El Capitan install.

Also, did you make your UniBeast installer legacy instead of UEFI ?
 
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OK that makes perfect sense, sorry for not following your advice, I wanted to avoid reinstalling win 10. Can I still do a dual boot with El Cap and win 10? If so are there any instructions on the tonymac86 site?
Also, can I still use the pre made USB stick with a clean hard drive?
 
Yes, you can still dual boot with Windows 10. Makes things a little more complicated. When you partition the drive leave enough room for Win10 on a FAT32 formatted partition. You can deal with that later.

I would just focus on El Capitan for now and forget about dual booting. Getting El Capitan working will be enough of a challenge.

If your Unibeast drive was created Legacy yes, you can use it.
 
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OK now I really have a mess......Upon installing a new hard drive for the clean El Cap install I bumped a connector for the Graphics card fan. The El Cap install went great but after a few minutes the machine went into a reboot loop. Took the cover off and could smell the heat. The graphics card overheated with out the fan running and long story short, the motherboard burned out. ( I proofed this theory by replacing the power supply and graphics card, still boots for 2 seconds and shuts off without anything connected to the board)

So now I have newer hardware, Gigabyte GA-B85M-D3H motherboard, Intel I7 4GHZ processor, 16 GB Ram, but am using the onboard Intel HD 4600 Graphics for now.

Booted from the USB stick made from Unibeast just as instructed. Installed El Capitan. Ethernet works, sound works, graphics works, without any config with Multibeast. Before I could launch Multibeast, the power went off at home (heat wave) and the machine went into reboot. The Clover screen gives me options for booting so I pick boot El Cap from Hard Disk but nothing happens, I also boot from the USB stick but nothing happens either. The El Cap install on the USB only is a few MB now not GB. Since I burned out the Snow Leopard machine I have no way download El Cap and redo the USB, I have access to a Mac at work but its running Sierra and wont allow me to download a new copy of El Cap.

Also, I formatted the USB with Legacy since it was made for the Snow Leopard hardware but my new hardware is UEFI bios.

Have no idea what to do next.
 
If you have the Snow Leopard DVD I would install that onto the Haswell system. Use iBoot Haswell of course. Download El Cap and create your UEFI USB and install that. Then you should be able to download Sierra from the MAS.
 
So it sounds like I will set up Snow Leopard on the new hardware just for the sake of downloading El Cap, then format the USB Stick for installing El Cap. I'm guessing minimal configuring just for formatting the USB stick. So what is the Haswell system? Also what happened to the El Cap install files on the formatted USB stick? As you said earlier, I'm not really interested in Sierra, just something newer than Snow Leopard,hence El Cap. I was under the impression that once the USB Stick was created, I could use it forever.
 
The B85M motherboard is Haswell based. You need to use the iBoot Haswell version CD to boot and install SL on it. I have no idea what happened to your installer. May you have better luck this time around. Remember to choose UEFI when making your new El Capitan installer.
 
OK I downloaded the Iboot Haswel and burned it to a cd. Placed the haswel cd in the drive, booted machine. At boot prompt, ejected iBoot, inserted my Snow Leopard CD pressed f5, chose boot snow leopard, got all the way to the language choice but no mouse or keyboard response. Tried every usb port and rebooted. Still frozen at the language choice.
 
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