Scrambled screen

Hello, I think my graphics card is faulty on my Dell computer because the screen display is scrambled into a very fine chequer-board that is unreadable.
I cant check and download new drivers because I can't see anything clearly on the screen. Could I check graphics card by taking it out and putting it into my other computer (Tiny) to see if it is at fault As you can probably guess from this question, I am not very computer literate!
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