with the graphics card - you've updated the drivers, so it's a hardware problem.
The first thing to check is that the graphics card is seated properly in its slot, and that it's cooled properly. If you're up to opening your computer's case, take hold of the card and gently push it down into its slot whilst rocking it very slightly.
Check that the lead to your monitor is correctly and tightly connected at both ends. Run your computer with the case off, and check that the card's cooling fan is running.
If all those checks come up OK then I'm afraid it's looking as if the card itself is faulty.