2 weeks ago I bought a new PC (in parts; built it myself).
It worked fine until this morning. Yesterday I did nothing strange; just checked email and played some minecraft; turned PC off like normal.
This morning I pressed the power button, fans started spinning, LEDs turned on, and then it turned all off again. 1 second later it repeated this and kept repeating this until I turned off the PSU.
First thing I did was reset CMOS; and that worked. Computer is currently running fine again. But I would like to know why this happened. I did not change any hardware, software etc. nor did I change any BIOS settings. What could have caused this?