I am helping a friend to fix her MacBook Pro 13.3 performance problems.
It was barely booting, and terribly slow for disk seeks. Then I replaced the HDD.
It was perfect with new SSD and El Capitan installation but in the third boot it become same bad as before.
It is so weird but I realized when I disconnect the HDD cable for a while then reconnect it, it works good for 3-4 boots then it become extremely slow again. I know that this model has a cable problem but I can't understand what kind of problem is this. I thought it could be a firmware problem and I don't want to waste money on buying a new expensive cable.
Any advises on that?