I wake up this morning and start up my nMP, and all I get is a grey screen... No Apple logo, no error message. After about 3 minutes it finally gives me the folder with the question mark in it. So, I boot up off a USB key (Mavericks), and Disk Utility does not even see the SSD stick in the nMP I try an SMC reset, a PRAM reset, and tonight I'll try to re-seat the SSD stick. What am I dealing with here - a broken SSD stick, or the interface it self? I booted up Windows 8 off the external Thunderbolt SSD and it worked just fine. The graphics cards, the MoBo, and the RAM all worked just fine. Of course it didn't see the internal SSD, but that was expected. I talked to my supplier, and they want the entire nMP sent in, but I have asked if they can just settle for the SSD stick, and then send me a replacement... If I get to keep the nMP itself whilst waiting for a new SSD stick, can I install OSX on an external SSD? I have the Sonnet Express Echo box (external PCIe expansion with an Accelsior card in it), but have never tried to run OSX of this. If not the Thunderbolt, then can I install OSX on an external USB3 SSD? Suggestions?