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?