Yup, typical! Has it completely died?
System powers on for just over a second, you can hear optical drive spin up momentarily, then power is lost and it "reboots". The Power LED on the case does not fully light up.
During this time, the onboard debug display does not even get chance to show a full code.
In the summer, I had a problem with intermittent power loss, it was odd, happened when there was no obvious power draw. I got a new PSU but the problem went away before I fitted it.
My PC is pretty much on 24x7.
However, this last weekend, we went away so it was turned off for 3 days.
When came back, that is when the problem was apparent. I changed to the new PSU, reset BIOS, RAM is seated as it should, still the same problem.
While we were away, I know there was a power cut. Is it possible there could be a minor surge when power is restored so even if the computer is turned off, it could cause damage? I would expect the PSU to have taken the brunt of any such surge though (Corsair CX750M) but I suppose there is a possibility of component damage but that would be unlucky. Other systems in the house with lesser quality components were OK.
Factoring in the power issue in the summmer, I think If you held a gun to my head, I would say it is a capacitor. I know modern systems have solid caps nowadays but they still fail.
That is my amateur diagnosis anyway
