Now this is a surprise. Looks like this GeForce GT 730 really was defective after all.
I was playing a little with Mac OS X, then due to chipset compatibilty problems i decided to go back to Windows 10.
It was finishing installing, so i left the PC alone...
When i came back, turned on the monitor, it looked a broken TV or something: Showing all sorts of colorful artifacts, blinking...
My advice to everyone here: Avoid NVidia cards if you can.
Now i'm back to the old but trusty AMD Radeon 6450! 😃
Edit: I was wrong. The colored artifacts were temporary, and are now gone.
Edit 2: I found that it is actually the monitor, it shows visual glitches even if disconnected from the PC.
Avoid nVidia cards?
Astonishingly practical advice. (No, I'm not an nVidia fan. I admit that my most recent Radeon was a 7970. Huge, power hungry, but fast. My favorite 3D graphics processors were made by 3dfx. The Voodoo 1 card did great things with the original DOS based Tomb Raider game.)
Why avoid Nvidia cards? They are fine! I have a GT 730 and a GTX 750 Ti and they run flawlessly. What brand is it?
As i said, i was wrong about this. It was not an issue with the card, but with the monitor and/or It's cable.
But when i first encountered the issue, i thought the GPU was the culprit.
I have put the 730 back into the PC and It's working fine.
It's from Zogis, model ZOGT730-2GD3H12.
I didn't mean to sound like an nvidia hater or something like that.
Oh whoops, I did not read that part That's great that it is working fine!
I didn't think you were a Nvidia hater.
You could have removed the offending sentence when you edited the post. Or would you have regarded removing it as unethical?