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the graphic card upgrade doing flashing colours

HP Recommended
HP Compaq Elite 8300 all in one
Microsoft Windows 10 (64-bit)

I have an hp compaq elite 8300 all in one computer and i tried to have an upgrade of the graphic card. Following the advice from HP website i found all 3 graphic cards which are compatible with this computer. I done the upgrades but everytime when i switch on the computer every time the screen start flashing all colours.

Is any one knows what`s happened and can help me to sort out this issue?


Thank you very much

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