Replacing graphic card

i'm replacing my gt620 with a gtx550ti but I get no display. what do I need to change in my bios or eufi?
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More about replacing graphic card
  1. Please tell your pc specs.
  2. If you have an OEM pc, I think there's a chance you can get UEFI compatibility problems. No video, no boot etc.

    But honestly, no can tell you anything if you don't list your specs
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