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desktop and mac wont work VGA?

post #1 of 7
Thread Starter 
Hey guys... So i've been running two monitors now, and with my second monitor, if I plug it in VGA to either my mac, or my desktop as teh 2nd monitor, it doesn't even find the monitor.. but the second i use the DVI cable, it works fine??

The VGA adapter for the monitor does work because i just used the monitor VGA with brothers computer while fixing it...

Ideas??
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post #2 of 7
If you plug your primary monitor into the VGA port on both computers, does it work?

If you plug your primary monitor into VGA and the secondary ("faulty" one) into DVI, will both of them work?
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post #3 of 7
Thread Starter 
so my main monitor is using VGA (because i heard that HDMI gives more ghosting in games and such).. and if i unplug the VGA and plug into my macbook, it doesn't work.. so its clear my macbook only works with true DVI, not VGA-DVI converter...

but why wont it let me run dual displays on my desktop, both VGA? it will only work with one VGA and one DVI..

silly technology
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post #4 of 7
HDMI and DVI are electrically the same, so there should be no difference in quality or performance. "DVI to VGA" adapters actually make use of the VGA signals present in DVI-I connectors; digital-only DVI-D connectors won't allow the adapter to connect.

If anything else, DVI/HDMI perform better than VGA. There are more steps involved in VGA than DVI.
DVI: digital video signal => cable => digital monitor
VGA: digital video signal => D/A converter => cable => A/D converter => digital monitor

So, as far as your situation: use the DVI and VGA inputs on the desktop for multi-monitor. This seems like a limitation of your video card, since using the DVI-to-VGA adapter essentially engages the VGA encoding circuitry and it seems like there's only one of these on your card for some reason.
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post #5 of 7
Thread Starter 
So its weird, apparently only the top DVI port on my video card works with VGA->DVI, the bottom one doesn't? lol

anyways so i tried using second monitor VGA instead of DVI, and doing first monitor HDMI->DVI... and WOW.. does my new 24"LED look BAD as HDMI->DVI... monitor doesn't auto adjust to fit the screen, so big black box around the picture.. and colours are messed up, having a white window up then minimizing it, leaves clear colour distortion of the background (rainbow like) for a split second.. its rather embarassing..

guess i'll use my DVI switch on second monitor to split up that connection and switch between the two as needed.. now just need more DVI cables lol
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post #6 of 7
The bottom one may very well be DVI-D but I don't see why the connector physically fits.

With the HDMI one, what resolution/refresh rate/color depth are you running it at? Make sure these settings are correct. Settings slightly outside the range may cause these issues without triggering a monitor "out of range" error, and Windows doesn't always pick the right ones for you.

Side note: "auto-adjust" adjusts the clock and phase settings automatically for an analog VGA signal as it's being converted to digital. It's irrelevant, and thus disabled in the menu, for a digital signal.
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The Beast
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Corsair Force GT Corsair H110i Windows 10 Professional HP LP2480zx 
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post #7 of 7
The bottom one may very well be DVI-D but I don't see why the connector physically fits.

With the HDMI one, what resolution/refresh rate/color depth are you running it at? Make sure these settings are correct. Settings slightly outside the range may cause these issues without triggering a monitor "out of range" error, and Windows doesn't always pick the right ones for you.

Side note: "auto-adjust" adjusts the clock and phase settings automatically for an analog VGA signal as it's being converted to digital. It's irrelevant, and thus disabled in the menu, for a digital signal.
The Beast
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CPUMotherboardGraphicsRAM
Xeon E5-1650 v2 ASUS P9X79-E WS NVIDIA GeForce GTX 1060 32GB DDR3 
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KeyboardPowerCaseMouse
Corsair K95 RGB with Brown switches Corsair RM1000i Corsair Obsidian 750D Logitech MX Master 
AudioOther
Cambridge Audio DACMagic Mellanox ConnectX2 10Gbps 
  hide details  
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The Beast
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CPUMotherboardGraphicsRAM
Xeon E5-1650 v2 ASUS P9X79-E WS NVIDIA GeForce GTX 1060 32GB DDR3 
Hard DriveCoolingOSMonitor
Corsair Force GT Corsair H110i Windows 10 Professional HP LP2480zx 
KeyboardPowerCaseMouse
Corsair K95 RGB with Brown switches Corsair RM1000i Corsair Obsidian 750D Logitech MX Master 
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Cambridge Audio DACMagic Mellanox ConnectX2 10Gbps 
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