Hi My macbook have started messing with me (again). I have a new SSD so it's not the problem. I had the flashing folder about two months ago so I changed the SATA cable and it started working again. A few days ago it started behaving weirdly, took around 5 minutes to start up. I ran a s.m.a.r.t test which gave me a warning about data transfer. I don't remember what it said but I concluded that it was either the cable or the motherboard. So I took it apart and made sure the cable was in place and I also ran apple advanced hardware tests which said that nothing was wrong with the motherboard. Started it up twice yesterday, first I got the flashing folder and then the startup was like normal. Today, however, it gives me the flashing folder again. So it's working semi-normal (except a little slower than usual) sometimes and sometimes it doesn't work at all. What could possibly be wrong with my computer? It is an early 2011 13".