I have a 2006 era Mac Pro I've been using as a file server. It's running Lion Server, the latest version, and all software is up to date. There's very little installed on it beyond the OS.
When I boot it up it runs fine for some random amount of time, then it freezes. It is headless but I have left screen sharing attached and can confirm that it's not crashing, it just stops responding.
I've got a copy of the system log and there's nothing out of the ordinary in it. Of course the log is full of errors, as they always are, but nothing is jumping out at me. The last line before most of the freezes is
Sep 16 19:16:59 mastiff servermgrd: No requests in 300 seconds, shutting down
But from what I can see in Google that's not likely to be causing the problem.
Unfortunately with it being headless I can't watch it boot, so I'm not seeing the boot messages. It's so old I don't have a monitor that will connect to it.
I need suggestions as to how to figure out what's really wrong, so I can determine if it's possible to fix. Thanks in advance!