Reddit mentions of HDE DVI 24+5 (DVI-I) Male to VGA Male Cable - 1.5M (5-Feet)

https://www.amazon.com/dp/B002IWP87S/ref=cm_sw_r_cp_apa_UAdPAbK9GDWCD

Or something similar - depends on your computer's video outputs. Or invest in a better monitor.

GT 1030 also has a DVI-I port, and so you could use a DVI-I to VGA cable like this one on Amazon

Or as /u/Minty090 Suggested, you could get a HDMI to VGA adapter.

well - you can get the cable that you want

I have personally run into the HDCP issue several times. I have run into the power issue once. The HDCP issue comes up often with active converters who don't respond correctly to the HDCP requests.

Both of these issues that I described are very hardware dependent - different manufactures approach standards differently. I have seen HDCP issues where the display never came on, or would come on for 10 seconds and then shut off. Also, HDCP should only be active when you are trying to display protected content, but I have run into instances where it was active at all times.

The power issue, I ran into that with a large monitor wall solution - the company provided a computer that could drive 24 displays at once, but couldn't handle active HDMI repeaters.

I have been a television engineer for a long time - making different displays work with different sources is a lot of what I do. Personally, I would try and address the problem that the DVI to VGA is having, because that is how this is supposed to work.

You can get a DVI-to-VGA adapter almost anywhere. Or even more simple, go with a vga to dvi cable:
http://www.amazon.com/HDE-DVI-DVI-I-male-Cable/dp/B002IWP87S/ref=sr_1_15?s=electronics&ie=UTF8&qid=1398029060&sr=1-15&keywords=dvi+to+vga+adapter+cable

Although honestly, you might be better off grabbing a new monitor. I can't imagine that a VGA only monitor is going to get the full use out of a 760. $80 and craigslist will get you some decent screens. But until then...that $7 cable is probably your best bet. You might be able to save $2 and just get the vga-dvi adapter, but that's going to stick an extra 2+ inches out the back

DVI to VGA Cable: https://www.amazon.com/HDE-DVI-DVI-I-male-Cable/dp/B002IWP87S

DVI to VGA Adapter: https://www.amazon.com/StarTech-DVI-Cable-Adapter-DVIVGAMF/dp/B000067SOH

Take your pick.

Does this look it would be good? https://www.amazon.com/HDE-DVI-DVI-I-male-Cable/dp/B002IWP87S

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Check here. Does your graphics card have DVI-I? If yes, then you'll need this cable or this adapter. If not, only an active adapter but it's not worth it.

Update: double checked the monitor on another spare tower and everything is fine on the other one when I run VGA to VGA so something has to be up with the HP desktop.

The P6000 only has one VGA port and DVI port. My monitor only has a VGA port. Do you think a VGA to DVI adaptor might solve the problem? Something like this maybe? http://www.amazon.com/HDE-DVI-DVI-I-male-Cable/dp/B002IWP87S/ref=sr_1_5?s=electronics&ie=UTF8&qid=1463415573&sr=1-5&keywords=vga+to+dvi)

Those splitters are for mirroring the same image to two displays. It's not going to let you use them as two separate screens.

What you could do is get a cable like this that will go straight from DVI-I to VGA.

Oh, like this one? My bad.

Here.