Black screen for 5 minutes after replacing hdd with ssd
crwdns2934249:0crwdne2934249:0:
Hi,
After installing new sata ssd my imac boots with black screen. It stays like that for 5 minutes and then login screen appears. No apple boot logo or error or progress bar. Straight black screen(without back light)and then straight to login screen. I can hear chime and usb has power. All diagnostic leads lights up. If I let it sleep or restart computer it again takes 5 minutes to light up screen.