Intermittent video loss

Question

Video cards

Hello comrades.
A new mystery of nature has arisen. There is a desktop computer. From time to time, when loading it, there is no video signal (even an invitation to enter the BIOS does not appear). At the same time, as far as can be judged without an image, Windows boots successfully. There is a separate video card in the system unit, there is also a built-in one. All coolers, incl. and on a separate video card at the time of the absence of a signal they spin.
Checking the video output of the built-in video card also showed no signal, i.e. The problem is not in determining the main video card using the BIOS. A reboot cures this, but only if you unplug the system unit's power cord from the outlet (it solves the problem in 1-2 attempts). Once I managed without removing the cord - after an unsuccessful start, a lot of time just passed (about 12 hours) - the computer turned on normally, the video worked.
So far, the working hypothesis is problems on the video card, it is old compared to the rest of the components. However, I am ready to consider other options, because. I don't want to miss out on a purchase.
Well, configuration: Intel Core i7-2600 CPU 3.4 GHz, Motherboard Z86A-D3H-B3, Video nvidia GTX-460

Answer 1

What power supply and temperature with Ada64, otherwise to fortune tellers ...

Answer 2

So, here are the readings of all available temperature sensors. As far as I can see, there is no data from the power supply. But indirectly, you can see that everything seems to be in order - its cooler rotates very slowly, it is also not hot to the touch.
Power supply model IN WIN IP-P850BK3-3 850W . The load on it should be very moderate for such power.
I would also like to note that, in my opinion, the features of the manifestation of the bug do not seem to correspond in terms of symptoms to the problem with BP. It turns out that the computer either immediately boots up normally, and after that the image does not disappear for a second, or it is immediately turned off. At the same time, I turn on the computer both after a long rest and after a long work. Those. part of the signal loss occurs when all components are cold at the moment of switching on.
Most of all, it looked like it sometimes uses the wrong video output when turned on, but one thing: all video outputs are inactive at this moment.

Answer 3

It's still a problem with the video card. At some point, it stopped producing a video signal altogether, replaced it, everything is fine with the new video card.