hmmm, I was looking for someone with my issue, but it seems you have a different story than mine, anyways; before you RMA your card check the cable that connects to the monitor, it might have damaged pins, if you used the same cable in your friend's PC, that might be it. if not then there is some other scenarios:
*assuming your PSU can handle the card, my card has larger Power phase design than the reference one, causing it to draw more power.
*temps, does it overheat? the fans might not work properly or the heat sink is dusty.
if not then, sorry I couldn't be of much help 😞