Computer won't restart after data download to external HD.

Hi,

Using WinSCP I was performing a large data download to a 1TB external hard drive. I left the computer alone for about 48 hours before returning to check on its progress. When I returned the machine was off and would not restart after several attempts. It's running Startup Repair now. I put the external on a different machine and there are two files installed with random 20 - 30 character names that I cannot access. Maybe these were installed by a Windows update? Unfortunately I do not know much about the computer on which I was running the external, except it's a Dell Precision T7600. Any help would be appreciated.

Heh, the 48 hour wait time was just due to logistics. I let Startup Repair run, do nothing, and finish; the computer restarted fine. Those random files disappeared from my external as well, and the partial data that did manage to be downloaded appeared. I'm baffled. I'm not familiar enough with WinSCP either to figure out what could've happened. Could it really shut a computer down? I suppose a power outage is another possibility, as all the other computers in the room were randomly off as well.