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Why is my graphics card doing this?

I install a graphics card. PCIE x16

my computer boots up normal according to hard drive noise, lights flickering, etc. but my monitor connected to my graphics card shows 'no signal'

so I switch the monitor to the onboard graphics, and boot the computer up and still no signal.

I decide to remove the graphic card and then boot the computer up again monitor to onboard graphics, it works perfectly.

what could be the problem?

4 Answers4