There are masses of reasons why a new graphics card would not work but there are sometimes only two very simple reasons why the card won’t function correctly.The first of these reasons is your Power Supply Unit, sometimes called a PSU, they supply your P.C with energy for the system to function,
a large amount of times when graphics cards stop working, this is the 1st place to look as the PSU isn’t powerful enough to power up the graphics card.

1) Power Supply Unit – There are multiple symptoms that would lead a user to believe the PSU is the real reason for the graphics card not working. The first of which would be the graphics card not working after installation into the Computer . This would lead to the screen refusing to show anything, leaving a black screen on the monitor as the PSU is too puny to power the graphics card and P.C together. Another sign of this problem may be the graphics card at first works but if it is put under any stress, it’ll simply turn off on the user. By that I mean the card will stop working and the monitor will turn black, that will be the case if the user would try to initiate any kind of 3D based game which would have the graphics card try and power up, only to fail once it realizes it does not had enough power that it requires. To give an example, I purchased a graphics card that claimed the minimum PSU was 400W, initially the graphics card would work fine, but after I attempted to start a game the monitor would go black and I’d have to restart the PC for it to work in spite of the indisputable fact that I had a 400W PSU which was the minimum.

It was not till I acquired a 650W Corsair PSU the card at last worked correctly, but not after going thru multiple other PSU’s that, despite having a high wattage, refused to power the card which explains why you want to purchase a PSU from a well-known company instead off an off brand.

2) Overheating – This is the commonest form graphic card failure to date. Usually if you a purchasing a new graphics card for the 1st time, the airflow within the P.C will not be all that superb for a rig with a graphics card. Depending on the card, the case could have a tendency to overheat extremely quickly if the airflow within the case isn’t all that great. The simplest way to deal with that’s to be sure the case is clear of obstructions like PSU cables all over the place and ensure every fan has sufficient room to work efficiently. Talking from experience, over heating could finish up utterly destroying a graphics card. If a machine gets too hot it might cause the graphics card to “burn out”, that means that it just stops working and will not work again at which point you’d need to return the card. The simplest way to battle this is to install some case fans to keep the card cool and if you can, get a spot cool fan which you can place immediately over the graphics card to keep it nice and cool consistently.

3) Drivers – The simplest cause is graphics drivers. Sometimes users have old drivers on their PCs from prior graphics card which contest with the new graphics card. At which point the user would need to get rid of all old drivers and install the other ones for the graphics card.