Things I've tried since my initial post.
- Rebooted the server few times in the hope that it will magically solve the problem
- Manually updated to the latest version of PMS (This replaced the config file with the default one but I backed up the script version and just replaced it after the update)
- I've located the crash report but I don't know how to read it. It's a .dmp file, not sure what to do with it.
The PMS is still down ARGH , I wish the logs were clearer with what the problem is.
Next I'm going to try to restore Plex from CrashPlan, for yesterday's backup. I've never done this before, hope it works.
if that doesn't work, the last resort will be to re-install Plex