Hi I have a 13" mid-2009 MBP 2.26ghz. All hardware is still factory standard except for the RAM which is now 4GB from Crucial. It's running the latest version of Lion. I purchased a 256GB Samsung 830 SSD with the intention of replacing the existing Toshiba HDD. Initially I connected the new SSD via a SATA>USB cable and formatted, then did a clean install of Snow Leopard using the DVD which came with the MBP. All went well and I am able to boot to the SSD happily via USB. The problem comes when I attempt to install the drive internally via the SATA cable - the drive is not recognised at all. Attempting to boot results in a blank white screen. If I boot to the Snow Leopard DVD first it starts the install program, but does not recognise the SSD when it comes to choosing a drive to install to. If I swap the HDD back in it is recognised by the SATA fine, and the SSD via USB is still recognised fine also...therefore the SATA cable is working properly - but perhaps not compatible with the Samsung 830? I have reached the end of my (limited) technical knowledge and despite numerous similar queries can't find any information on the web, so any help would be greatly appreciated. Thanks!