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Black screen after installing gtx 750ti and 2gb ram

HP Recommended
Pavillion 500-205t

I recently installed 2 gb of ram to my computer to make it a total of 10gb and installed a EVGA 750 ti graphics card. I checked beforehand that these items were compatible, but for some reason my monitor won't turn on. I can hear my computer running and it makes the beep noises but my monitor says it can't find an output even though it's plugged in.

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