Why my iMac doesn't turn on and makes strange alarm sound?
Hello! I had a problem with my logic board. So i took it out and send it to repair (it was not possible to send the whole mac). But when i installed the repaired logic board and turn the mac on it only turns on the fan and it makes an strange alarm sound. Here is a video when i turn it on. It is an especific error of something i did wrong? or it could be a lot of things? I'm doing it myself cause where i'm from we don't have many technical service. Thank Youuuuu