I assume by your post that you have a physical graphics card installed in your system, rather than the graphics being integrated onto the motherboard.
Make sure firstly that your system is switched off!
What you can try is to carefully remove the graphics card from the slot, and then reseat it back into the same slot.
Although you might what to blow any dust away from the contacts on the graphics card and from the slot on the motherboard before inserting the card back.
This could possibly resolve you little problem, let us know how you get on?
Good luck
DKTC
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