After inserting graphic card my computers display become more dity all

After inserting graphic card my computers display become more dity all word come scattered everywhere with different colors?
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More about after inserting graphic card computers display dity
  1. If you have followed the basic steps of replacing the card, remove old card in device manager/ shut down/ physically install new card/ boot up and install drivers for new card, then it might be faulty.
  2. Is it a new system or you upgraded your VGA only ? if so,then tell us the model numbers.
  3. What rolli59 and Maziar said. Is this an upgrade to an old graphics card? Can you tell us the graphicc ard in particular, your cpu, motherboard, and powersupply would help as well.
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