Can't boot from internet recovery
2011 MBP running 10.13.6 recently failed to boot, I ran internet recovery but unresponsive to every aspect, e.g. can't repair disc (every function greyed out), can't reload OS, can't recover from recent Time Machine backup. This latter function shows the most recent backup on the Time Machine disc which I select, but when I look for the disc to backup to, I can't see it. In Disc Utility I can see the base system, but as I said all options are greyed. Any help gratefully received, thanks.
MacBook Pro 13″, macOS 10.13