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Can't get 3 monitors to display. Please help!

post #1 of 18
Thread Starter 
So I have two 24 inch Dell led monitors and recently purchased a BenQ XL2420T to be my main monitor. My problem is I can't display the 3rd monitor. I have one dell connected by hdmi, the other dell by vga from the monitor to the computer's dvi-d / vga adapter. This was how it was running before I bought the BenQ. After I plugged in the BenQ by the mini dvi port now it works but the dell that is connected by dvi-d/vga is not working. Can some please explain what I need to do.

Here is my specs:

"EVGA SuperNOVA NEX650G 80PLUS Gold Certified ATX12V/EPS12V 650W Power Supply 120-PG-0650-GR"
"Seagate Barracuda 7200 3 TB 7200RPM SATA 6 Gb/s NCQ 64MB Cache 3.5-Inch Internal Bare Drive ST3000DM001"
"Corsair Carbide Series 200R Compact ATX Case CC-9011023-WW"
"Samsung Electronics 840 Pro Series 2.5-Inch 256 GB SATA 6GB/s Solid State Drive MZ-7PD256BW"
"Corsair Vengeance Blue 8 GB (2X4 GB) PC3-12800 1600mHz DDR3 240-Pin SDRAM Dual Channel Memory Kit CMZ8GX3M2A1600C9B"
"SAPPHIRE 100354XTL Radeon HD 7870 XT w/Boost 2GB 256-bit GDDR5 PCI Express 3.0 x16 CrossFireX Support Video Card"
"Intel Core i5-3350P Ivy Bridge 3.1GHz (3.3GHz Turbo) LGA 1155 69W Quad-Core Desktop Processor BX80637i53350P"
"MSI B75MA-E33 LGA 1155 Intel B75 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard with UEFI BIOS"
"LG 24X DVD Burner - Bare Drive 24X DVD+R 8X DVD+RW 8X DVD+R DL 24X DVD-R 6X DVD-RW 16X DVD-ROM 48X CD-R 24X CD-RW 48X CD-ROM Black SATA Model GH24NS95 - OEM"


In order of appearance....back of computer, back of Dell monitor, back of BenQ monitor:






Edited by Swith - 3/6/13 at 7:40am
post #2 of 18
you need an active display adapter to have 3 monitors work this one is highly rated and I own two of them with no problems myself

http://www.newegg.com/Product/Product.aspx?Item=N82E16812200944

good luck
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post #3 of 18
AFAIK you can only do two monitors when using the HDMI output with another one... DisplayPort will give you all 3

The acceptable config can be

DVI+DVI+MiniDP/DP
VGA+DVI+MiniDP/DP
3 MiniDP/DP ports

DVI+HDMI
VGA+HDMI
Edited by raidmaxGuy - 3/5/13 at 7:44pm
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post #4 of 18
Thread Starter 
Quote:
Originally Posted by Blade 117 View Post

you need an active display adapter to have 3 monitors work this one is highly rated and I own two of them with no problems myself

http://www.newegg.com/Product/Product.aspx?Item=N82E16812200944

good luck

Maybe I misspoke but that looks like what I'm already using with my BenQ. Maybe I should buy another one?
post #5 of 18
Thread Starter 
Quote:
Originally Posted by raidmaxGuy View Post

AFAIK you can only do two monitors when using the HDMI output with another one... DisplayPort will give you all 3

The acceptable config can be

DVI+DVI+MiniDP/DP
VGA+DVI+MiniDP/DP
3 MiniDP/DP ports

DVI+HDMI
VGA+HDMI

What if I'm only just using one hdmi? Nevertheless I think I'll ditch the hdmi and see what happens. Thanks
post #6 of 18
Quote:
Originally Posted by Swith View Post

What if I'm only just using one hdmi? Nevertheless I think I'll ditch the hdmi and see what happens. Thanks

Well, with my current sig GPU, I can only run my HDMI tv and one DVI-D monitor at once and disable one DVI-D monitor, or run both DVI-D monitors and disable the HDMI out... So HDMI seems to throw a kink into the system.
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post #7 of 18
Thread Starter 
To better explain the situation, here is a picture of how I had it setup with 2 Dell monitors (vga to dvi-d adapter and hdmi). Then I bought a BenQ and attached it to one of those mini display ports by using a DVI-D chord and DVI-D to mini display port adapter. Seems like what I should try now is removing the hdmi and connect another monitor via the mini display port correct? Thanks for all the feedback!

post #8 of 18
Quote:
Originally Posted by Swith View Post

To better explain the situation, here is a picture of how I had it setup with 2 Dell monitors (vga to dvi-d adapter and hdmi). Then I bought a BenQ and attached it to one of those mini display ports by using a DVI-D chord and DVI-D to mini display port adapter. Seems like what I should try now is removing the hdmi and connect another monitor via the mini display port correct? Thanks for all the feedback!


That DVI->DP cord isn't really a DisplayPort connection. It's really a DVI connection.

So what you're looking at right now is:
DELL 24" -> DVI -> VGA (really DVI)
DELL 24" -> HDMI
BenQ 24" -> DP->DVI (really DVI in this case)

You're trying to run 2x DVI and 1x HDMI signals off your video card, which unfortunately is a no-no. Besides of which, the BenQ XL2420T won't run at 120hz if it DID work.

You'll need some sort of DP->DVI active converter.

Before you try that, you can *try* doing the following:
BenQ -> DL-DVI to DL-DVI cable
Dell 24" -> HDMI to HDMI
Dell 24" -> DP -> DVI

That *might* work. Probably won't. Can't hurt to try though.
post #9 of 18
Thread Starter 
Quote:
Originally Posted by kevinsbane View Post

That DVI->DP cord isn't really a DisplayPort connection. It's really a DVI connection.

So what you're looking at right now is:
DELL 24" -> DVI -> VGA (really DVI)
DELL 24" -> HDMI
BenQ 24" -> DP->DVI (really DVI in this case)

You're trying to run 2x DVI and 1x HDMI signals off your video card, which unfortunately is a no-no. Besides of which, the BenQ XL2420T won't run at 120hz if it DID work.

You'll need some sort of DP->DVI active converter.

Before you try that, you can *try* doing the following:
BenQ -> DL-DVI to DL-DVI cable
Dell 24" -> HDMI to HDMI
Dell 24" -> DP -> DVI

That *might* work. Probably won't. Can't hurt to try though.

Thanks for the info. Would you mind looking at this link I list below (specifically the last post on that page). I think this is the reason the mini adapter I bought doesn't work.

http://www.tomshardware.com/forum/354966-33-connecting-monitor-mini-displayport-adapter

Today I ended up buying this which judging by the reviews will solve the problem. Is this the DP->DVI active converter. your talking about?

http://www.amazon.com/gp/product/B004RFGK30/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1


Also the dell monitors only have a vga and hdmi port. Does this mean I need to get a DVI adapter? Here is a picture:
post #10 of 18
Thread Starter 
I just realized something...are you saying the item I just bought (http://www.amazon.com/gp/product/B004RFGK30/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1) won't display the BenQ at 120 hz?
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