computer display

[TZachaty99]

How do you tell if your computer can currently handle 3 monitors?

[Huffer]

You tell us what kind of computer it is. You can't tell by looking at it we need to go reviews some technical specifications like what video system it has and what ports are available which varies by model of computer. 

[TZachaty99]

Its an HP Z240 SFF Workstation

[Huffer]

Yes it has 3 DP ports on the motherboard and can drive 3 4K displays: one from each DP port.

3 DP 1.2 graphics ports integrated in motherboard; Supports up to three simultaneous displays across DP outputs. Max resolution supported: 3840 x 2160 at 60Hz

https://support.hp.com/us-en/document/c04892038#AbT0

Post back with any more questions and please accept as solution if its the info you needed. 

[TZachaty99]

how do i get my third monitor on?

[Huffer]

So you have 3 monitors connected by DP cables to the 3 ports on the computer and only 2 of them light up?

[TZachaty99]

I only have two different inputs in the back of the computer

[Huffer]

Yes none of the Manuals I found show an actual picture of the I/0 plate on the back of the computer. Can you post a picture of the back of the computer? Never mind I found this:

Lower right corner has 3 DP ports

https://www.pcmag.com/feature/342477/hp-z240-sff-workstation

What does yours look like?

[TZachaty99]

it looks like that but mine also has the DVI and VGA inputs

[Huffer]

Well to have 3 monitors you have to use one of the DP ports at least. I always prefer to use DP over any other kind of monitor connection because it works way better for high res like 4K displays than even HDMI.