I do everything, reinstall and instal and reinstal, use old drivers, DDU to reinstal all drivers, everything, new bios, and still have yellow triangle
This could be one of three things, Windows corruption, video driver corruption, or a defective GPU.
Troubleshooting, you try to completely remove the drivers from Windows and clean reinstall them. If that failed you really have two choices, reinstall Windows or replace the video card. Unfortunately, you will either have to reinstall Windows to determine if the video card is works correctly, or replace the GPU and see if the problem continues.
I instal clean new windows 7 and still have triangle, should i try with win 8 or 10, if that not work then its hardware problem right?