I have a desktop PC that essentially acts as a media server, it was originally built as an HTPC but sort of morphed into more of a server type set up primarily running Plex. For a few months now it will go to sleep at some point overnight but not wake up in the morning.
Whenever this happens, if I push the power button the CPU fan comes on as does a second fan, however, 2 other case fans do not come on and the computer is completely unresponsive to any input from a USB keyboard or mouse, in fact, nothing even comes up on the screen, it still acts as though it is asleep/hibernating, not even sure what it is doing, to be honest.
Typically in these cases I have to hold the power button down to shut it off entirely, then push the power button for it to start up. However, there are times when not even this works and I have to remove the power cord from the PSU, press the power button, plug the PSU in again and just generally try any combination until it comes on. Usually by about the second or third attempt. Today, even after trying these steps several times it does not boot up fully, nothing appears on the screen, just the CPU and one other fan start. I have unplugged the PSU, opened up the case and unplugged the PSU from the motherboard, but it still will not boot further than those fans coming on.
I was running some software called "Lights Out" to put it to sleep on a set schedule, I uninstalled that a couple weeks ago wondering if that was the cause, since it is still doing the same thing I doubt it was that software. I have also set the BIOS back to factory defaults on any power settings, I forget what the windows power settings are. I have also tried disconnecting all the hard drives, removing RAM and removing CMOS battery, to see if it would boot with one of them unplugged, nothing makes any difference.
Any ideas? Short of starting to throw new parts at it I have no clue what to try next. When the machine is powered on it runs fine with no stability issues at all, if I remember correctly it is between 4-5 years old.
Edited by naiku, 11 April 2018 - 11:24 AM.