How to return an image from a discrete graphics card?

Question

Iron

Hello.
The problem is this:
About a week ago this happened, put the computer (as usual) into sleep mode, it surprisingly fell asleep for a long time. The next day I tried to turn on the computer - it turned on, but there was no image on the monitor. I decided to do a "hard reset", rebooted - did not help.
I already thought that it was suddenly in conflict with some other device - I pulled out everything that was connected to the back of the system unit, leaving only the power supply and the monitor cable. Surprisingly, the image appeared. Later, by typing, I determined that if the computer turns on with the Internet cable connected, there is no image, otherwise it is.
At one point, the image was not even with, even without an Internet cable.
I plugged the monitor cable into the motherboard (it has an integrated NV 8200 GT chip) and there is an image from it. Since the computer was no longer "blind" - I decided to look in Disp. devices, there is no discrete card, AIDA also showed nothing (only an integrated chip).
I tried the radiator on the vidyuhi - "usual" temperature, warm.
A computer with a video card inserted into the motherboard turns on for a very long time, it just buzzes for 3-4 minutes, then the OS is loaded. Without vidyuhi - loaded quickly, like never before.
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Here's what I already tried to do:
1) Reset the BIOS (pulled out the battery) - did not help
2) Changed the BIOS - did not help
3) Installed another OS - same situation
PC configuration:
OS - Win 8.1 x64
Mat. board - Asus M3N78 (with integrated graphics chip Nvidia 8200)
Video card - Nvidia GeForce 8600 GT
There is a network card from Realteck in the PCI slot.
The rest (percent, RAM) I think is not important.
This problem happened the next day after reinstalling the OS (OS from the face image obtained at the university. Before that, the same OS was already installed on this PC without problems.) Do
you think that the video card still died or you should hope for the best and look for another PC for checking it out?

Answer 1

I think 2 checks are needed to complete the picture:
1. Check the video card on another machine.
2. Put another card into the computer - what if there is a question in the motherboard?

Answer 2

As far as I understand, the PCI-E x16 slot died on the motherboard.

Answer 3

For some reason, the video card is initialized later than the motherboard, I met something similar on the forum. It was decided by replacing the vidyuhi under warranty (not your case).
The temporary solution was: turn on the computer, wait a few seconds, press Reset - the vidyuha worked fine.