MultiBeast also installs a clover bootloader and you can use it.
To know which EFI you are working with boot with USB to desktop/use terminal ..diskutil list/enter/ a box will pop up with all EFI partitions listed..Like 0s1 ,0s2 etc. take note of the one for HDD with El Cap/Use clover...
If at all possible disconnect all drives except the one you intend to install on/make sure Bios is set to UEFI/use F? to select USB to boot from/ in secure boot if other OS will not work try with win 8.1 to see what happens.
You will need nv_disable=1 boot flag untill you get nvidia drivers...
1. yes
2. If the Win7 is installed UEFI not hard to set up. if it is legacy may be difficult. SlimJim or some one
with more know how may chime in here.
3. You need to download and install Nvidia web drivers for your version of OS X, that should get your other monitor going and/or change to...
Do I have it right you have an installation on the SSD but cannot get it to load?
Assuming above is true..Make sure Bios is set up correctly and put boot UEFI only (no legacy)
El Cap has USB issues you can fix later, find a working USB2 for the USB..may have to try several.
Use -v nv_disable=1...
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