I’ve checked through all of the RAM and it’s all good. The diagnostic LEDs on the logic board indicating failure or overheating of both CPUs A & B are solid red lights. The trickle voltage is there (amber indicator). The issue manifests by complete failure to boot up - no startup chime sound although the fans start up and the power indicator lights up solid. Also no power to any USB ports so can’t even use key shortcuts to attempt other boot modes. Has anybody had this do I need to replace the processors ? Do want to buy to find it wasn't them ?