Fragmented graphic errors on the screen (Nvidia - laptop)?

After a few hours, some programs look like this. Games work without problems. CC Cleaner is also affected. It also appears to appear when devices such as headsets or a mouse are connected, but then disappears after a short time. Graphics drivers are up to date. No viruses and malware have been detected. It's about a friend's PC, unfortunately I can't do anything on site, so suggestions are welcome. Restarting the graphics adapter via Win Ctrl Shift B does nothing.

That looks like a broken graphics chip… I occasionally have that with my GTX 760 graphics card (tower computer). Therefore, I know that it must be a defective memory chip, which the graphics card can no longer be used correctly. In the case of the laptop, I can't say exactly whether it is the chip itself or a part of the graphics memory. But it definitely has something to do with a defect!

On the other hand, you can't do much with laptops…

Does the defect always occur or only in battery or mains operation? I can only use mine in network operation, otherwise I only get a white picture. Possibly. Is that related to the power supply.

It makes no difference, it emerges as well as.

Then there will probably be errors somewhere in the graphics system. The only thing that occurs to me quickly would be to keep an eye on the temperatures and load.

That is probably true, as I have just experienced, the guarantee is already over and the receipt is therefore gone.