Third monitor not recognized on new Mac Pro

Hi all!
So, I got my new Mac Pro a couple of days ago.
Spending two days migrating from the old Mac Pro.
Today I was going to setup my three monitors but only two of them is recognized!?
I have one HP ZDisplay hooked up via HDMI for output when editing.
I also have two Samsung monitors as standard monitors, those two are connected via DVI-Displayport into TB.
The problem is that I can only have one or the other of the Samsung monitors working at the same time.
This only occurs when I have the HP monitor connected via HDMI, as soon as I unplug that one, both of the Samsung monitors work.
Any ideas?

You are running into:
Can I connect a DVI display?
Mac Pro supports DVI displays using Mini DisplayPort to DVI adapters. Use a single-link DVI adapter such as the Apple Mini DisplayPort to DVI adapter for DVI displays with a resolution up to 1920x1200. Use a Dual-Link DVI adapter such as the Apple Mini DisplayPort to Dual-Link DVI adapter for resolutions up to 2560x1600.
Mac Pro supports a total of two single-link DVI displays. If you connect a third DVI display using a passive adapter or a display via HDMI, it will cause one of the three displays to become inactive.
Can I connect more than 2 DVI or HDMI displays?
Mac Pro supports a total of two DVI or HDMI displays when connected via the built-in HDMI port or using the Apple Mini DisplayPort to DVI adapter. To connect additional DVI displays, use an active DVI adapter such as the Apple Mini DisplayPort to Dual-Link DVI adapter. You can connect up to six active adapter DVI displays. This requires a powered USB hub since Mac Pro offers four USB ports and you will need six to connect them all.
From:
Mac Pro (Late 2013): Using multiple displays - Apple Support
If the Samsung monitos have a displayport/mini display port input use that. Otherwise you need to purchase an ACTIVE mini displayport to DVI adopter like this one
http://www.amazon.com/Accell-B087B-006B-2-DisplayPort-Single-Link-Certified/dp/B 0098HVZA0/ref=sr_1_3?ie=UTF8&qid=1421443353&sr=8-3&keywords=ACTIVE+DVI
or
http://www.startech.com/AV/Displayport-Converters/Mini-DisplayPort-to-DVI-Active -Adapter~MDP2DVIS
For displays greater than 1920X1200 yo need a dual-link adopter
http://store.apple.com/us/product/MB571Z/A/mini-displayport-to-dual-link-dvi-ada pter

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