I'm trying to repurpose a machine that I was previously using to run Mythbuntu. It's only been a couple of months since it was last running, but now I'm getting strange behavior when I turn it on.

What happens is this:

  • the power light comes on
  • the fan spins up
  • both power light and fan stay on for around 10 seconds
  • they both then cut out (the light immediately, the fan takes a second or so to spin down)
  • 3 or 4 seconds after this, the whole cycle repeats itself

This happens indefinitely. I have to either pull the plug or hold down the power button to stop it. At no point during this cycle does the connected screen come on, so I can't even get into a BIOS or anything. There are no beeps.

I don't even know how to begin diagnosing this. Can anyone offer any advice?

  • The motherboard might be damaged. Should check in the repair center.– AlexiyMar 28 '16 at 4:52

No beeps likely means it's not POSTing, which is a pretty low level failure. You have a few choices:

  • Reset the BIOS - pull the CMOS battery or short the jumper to reset the BIOS settings (you can likely google for the motherboard manual to find exact steps)
  • Boot with minimal hardware - disconnect all the drives and any add-on cards and see if you can get it to POST then. Add items back one at a time.
  • Hmm, even with the CMOS battery out and the SSD unplugged it exhibits the same behavior.– me--Mar 28 '16 at 4:39
  • Any add-on cards (video, sound, etc?) Minimal memory would also be worth testing, as would reseating everything . . .– ernieApr 4 '16 at 18:12

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