hello i need help with RX480 8gb nitro..my card was very hot and i take it to replace thermal paste and when i did that i put gpu back in pc and say no signal on monitor...i tryed everything i didn't do nothing just replace paste...and i take gpu to the electrician and he try gpu and say he really don't know what can be issue he say gpu has everything right power fans he try everything and he say he really don't know why gpu won't start like pc don't recognize it ..but card was working when i took it out and replace paste...what can be problem????any help