BLINKING "?" booting up
Hi - I recently had a problem with my MBP 2011 whereby it wouldn't boot up. I kept getting a blinking question mark. Thinking it was the drive that had failed, I replaced it with a new 500GB SSD and also a new HD cable. Alas, it still won't boot up and shows the blinking ? after about 30 secs.
Any ideas as to what this might be?
Thanks in advance for any replies.
Dan.
MacBook Pro 13″, OS X 10.11