Loop start on my MacBook Pro 13 inches
I have an old macbook pro 13 inches model A1278. When I turn it on, there is only white screen with apple logo and a small running loop below it. When I tried install the new harddrive, there will be an apple logo but with progressive bar below it. When this progressive bar went to half point, my mac shut down and restart again. I have tried Commend + R, Commend + Option + R + P, Shift...but no help. PLease let me know what wrong with my macbook.
Thank you very much!
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