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Thanks for the reply astrobruin. I'll try your suggestions with the changes necessary for my AMD gpu. Thanks!

And here's what it displays when I get into the Boot Manager: Notice it doesn't show any USB device. Please help!

Interesting! Thanks for the reply. I did *once* get all 3 monitors working and I was shocked, now I realized it was after waking the machine up from sleep. It never got working again. Option 2 sounds good, but wouldn't it be weird if I ran any programs that use graphics acceleration? For...

So I followed instructions to create a Clover boot USB drive, but when I try to boot from it via EFI, it goes straight to my Windows hard drive and doesn't show me the Clover menu at all. And when I boot from it in Legacy mode, it takes me to a strange "Boot Manager" that allows me to select...

So I followed instructions to create a Clover EFI boot disk, but when I try to boot from it via EFI, it goes straight to my Windows hard drive and doesn't show me the Clover menu at all. And when I boot from it in Legacy mode, it takes me to a strange "Boot Manager" that allows me to select...

How do I get the drives to show up with CSM disabled, then? One of the drives that disappears with DSM disabled is an SSD, I would imagine that one to work, at least, no?

Ok I'll look into amd7000controller framebuffer personalities. Earlier today I tried to select Windows 8 WHQL in my BIOS, but once I did that, most of my boot devices except for one which was apparently a UEFI device? Not sure how it became a UEFI boot drive when I don't remember selecting it...

I haven't tried the Windows 8 WHQL setting yes, but yes my Mobo has that setting and I'll try it tonight. However, the rest of it does indeed seem time consuming and... risky? I really don't want to brick my Gfx card doing that. I also want it so that it's still compatible with Windows while...

Anyone? Can anyone please help? My card is MSI R9 280X GAMING 3GB 384-bit.

Jeordanis, all I did was install Yosemite via UniBeast and Multibeast and I seemed to have 2 monitor support out of the box. Though, I think a while ago I did update the firmware on the video card to enabled GOP mode.. though I'm not sure how to verify that.

Hi all, So I just successfully installed Yosemite (via UniBeast and MultiBeast), but only 2 out of 3 of my monitors work. The card is a MSI Radeon R9 280X, and I have 3 monitors connected like so: Monitor 1 connected via HDMI to Active Mini-DisplayPort converter Monitor 2 via HDMI Monitor 3 via...