the power supply its good in my country there are many pepole useing that psu and its working good its very popular
You know, I hear this all the time from people in other countries and let me tell you the same as I tell them.
It's the same thing as somebody saying "dog turds are good food in my country". No, they are not. It does not matter WHAT country you are in, dog turds still taste like crap and you shouldn't eat them.
This is exactly the same. It does not matter WHAT country you are in, if a power supply is not good, it is not good. It does not matter where you are. A low quality power supply that is known to have issues does not suddenly just magically become "good" because you are in some other country where finding an ACTUAL good quality power supply is hard to do and expensive. You wouldn't use gasoline mixed with water in your country just because it makes it stretch further, because it's a really bad idea and will probably either ruin your engine or make it run very poorly. It does not matter what country you are in, water in your gas is bad. This is the same. It does not matter where you are, using a poor quality PSU is bad. Period. End of story.
That being said, you STILL did not say what the exact model of it is, and that is the FIRST thing we need to know to even know whether it's likely a PSU issue or not. Even a very good power supply could be at fault in some cases, much less one that is not a very good power supply. So, model? If you don't know, look. It will be ON the label on the PSU. Depending on how you have the PSU mounted you might have to remove the four screws holding it to the case and turn the unit so you can see the label. Usually, you should not have to do this.
Did you build this system yourself or did you buy it from somebody else? Did you install the CPU? Have you had this problem since day 1 that you owned this system? This might be important since it happens with two different graphics cards. What is the model of the other graphics card you tried?
Did you buy the parts for this system new or used, if you built it yourself? Or, did you buy a whole prebuilt system? Just trying to find out if you or whoever you bought it from assembled it or if it was assembled by some company?