The last few days I tried a couple of SATA III SSDs in my Macbook Pro 13" early 2011. One worked, some didn't. After that I went back to a SATA II SSD (Kingston V+ 100) that I was using before. I have this strange problem now. After pressing the power button there is a long pause 10-15 seconds where nothing happens. A white screen is displayed. After that the apple sign shows up and the booting begins. The Kingston SSD that first booted in 15 seconds now boots in about 30 seconds. The same goes for an Intel X25m SSD and other HDDs and SSDs. Also the installing process now takes much longer. Before OS X installed in 22 minutes on the SSD, now it takes over 30. I tried doing a clean install but that didn't work. Any ideas? Thanks in advance.