iMac 21.5 emc 2428 stuck on loading bar
Hi to everyone, I have an Imac 21.5 emc 2428 stuck on loading bar. I've opened it ed it was full of dust and change thermal paste(never changed before). The problem remains. Now I can't open mac recover os. I think this happened after an upgrade to Sierra. I tried a new hd and a new ssd but command + r doesn't work, alt doesn't work to choose hd or usb pendrive. The combination that works is alt command and r to activate internet recovery. After I've done internet recovery (after logo Apple with loading bar) complete I had an infinite white screen and the fans at very high speed. The strange thing is that the Imac with an hd with installed Win 10 works fine. Thanks in advance.
Es esta una buena pregunta?