My sapphire pulse 5700xt was working perfecting fine last night but this morning it gives me no signal.I unplugged and replugged everything to no avail.Finally i plugged in my old rx 570 and pc works perfectly fine.When the 5700xt is plugged the lights on it are on but still no signal.Is there anyway i could fix it because i do not have the option to RMA because i cannot find my proof of purchase.