I have previously had the problem of bits of plastic from the faulty hinge getting stuck in the fan, so there might be hardware damage related to overheating. There have been no recent hardware changes. In the hardware checkup I get a battery failure - primary replace 47 error message.
I can get in under safe boot, but even if I switch off non-microsoft services I can't get in with a minimal loading setup. Trying to use a boot disc, or UsB stick I get a message 'recovery - your PC / device needs to be repaired, a required device isn't connected or can't be accessed 0x0000185' Windows won't do the refresh or go back to previous versions options. I rebooted the laptop, and got a 'critical service error'.
Internal HDD that has been working fine for a year or so.