Late 2013 MBP 13" w/256 SSD. System started freezing periodically. I could force quit, restart and usually no problem for a while, then again it happens. Last time it showed the File Folder with ?. The procedure for Command-R restart allowed me to re-install to MBP disk. I did this procedure. At some point about signing into iCloud it failed. The next screen said "sorry an error occurred". The MBP disk never appeared again, so I could not re-install. I managed to install a working copy of El Capitan onto an external HD and that is what I'm using now. Using this I can see my MBP internal disk in Disk Utility. I ran first aid and it appears fine. The problem is it does not show up (select destination) when I try to re-install OS X from the internet recovery option and it does not show up when I try to restore the system from Time Machine. Only the drives in the USB port show up. It shows up in Disk Utility in the recovery mode, but when I select on it, all the options except first aid are grayed out. I hope this makes sense. I can answer all questions, but I'm not a computer geek so don't throw a lot of technical terms at me. What are my choices/options? Can this be solved at my level? Do I need to take it in to an authorized Service center? I’m in Thailand and my MBP is out of warranty, so if I can do this myself better.