FAN is running at high speed when off or in sleep mode.A problem with a 2012 21,5” iMac. If it’s off or in sleep mode the fan is spinning at high speed. iMac is working quite...
"Will not power on. Tried everything. HELP"に関する回答internal power supply is probably broken.
"Phone having blue spots at the bottom screen"に関する回答Bad screen service and quality. Go back for warranty or buy a better screen (original) and do it yourself :) if the spots are still there then it will be a backlight problem. So then they hit something on the logicboard.