PNY SSD not readable after shut down. I have tried changing Sata cable/ Sata slot. The BIOS reads it there sometimes on restart, but when it does It takes twice as long to load and still never shows up.
If the BIOS recognizes the SSD sometime only, I mean not all the time, and try it in other computer, if other computer does not recognize it all the time also. Then the SSD may has problem, RMA it.
I don't think PNY has a diagnostic program available to test their SSDs but contact them to see if they do. In the meantime try the HDDScan program available from http://hddscan.com/