How do I know if my monitor is digital or Analog?

Mudflap

Prominent
Mar 9, 2017
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This may sound like a dumb question at first, so let me give a little context.

I recently installed a new video card (it's an Asus Strix GTX970). It has 2 DVI outputs, one DVI-I and the other DVI-D, in addition to an HDMI and a display port output. I am using the HDMI for my flat screen TV for streaming my Netflix, Hulu, etc.. I have two other computer monitors and I wanted to use them both for computer activity (so three displays total).

I have difficulty describing these two monitors because one is old and one is poor. The old one is flatish (not like a CRT) and it works fine, but it came with a Dell computer from back in 2005, and hence I know nothing about it really. The other one is newer (got it 2011ish), but it is a lower end AOC model and I cannot find anything about it on www.AOC.com; However it cleary states that it is an LCD monitor on the back of it. Both of these monitors have only VGA inputs.

Anyway. After I installed this new video card, I found that I only had DVI-I to VGA adapters. So installed one and both monitors worked on it, so I used the AOC one. As to the other one, a friend had a DVI-D to VGA adapter and gave it to me, but he wasn't sure that it actually worked. I installed it, and neither of my two computer monitors worked on it, and so I figured that it must not work after all, and I would go shopping for a new one.

But before I buy one, a question has arisen in my mind. I know that DVI-D output on a video card sends only digital signal, while a DVI-I carries both an analog and digital. What if the reason that neither of the monitors worked on the DVI-D adapter was not because there was anything wrong with the adapter, but was simply because both monitors are analog?

I don't mind if one of my monitors is analog, of course, because I have a DVI-I output for it and it works on both. But I realize now that I have been assuming all along that since my AOC monitor is LCD that it is therefore digital and will work on the DVI-D port. Could that assumption be incorrect? In other words, could my AOC monitor be both and LCD monitor and yet, nonetheless, analog? And if that is the case, how would I know that it is in fact analog given that I do not have and cannot find any documentation for it online?
 
Solution
Anything with VGA is analog, others are digital. If you connect VGA monitor using and adapter from DVI-I to VGA, signal is still analog.