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Optiplex 755 only turns on through power supply button, no video output.

So I can't turn on my Optiplex 755 through the regular power button.  I have to hold the power supply test button on the back, and then press the on button.  The computer then stays on, but I don't get any video output.  No BIOS beeps or anything.  Not sure what's going on.  The service tag is

<ADMIN NOTE: Service tag removed per privacy policy>

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