Configuration:
CPU: Intel Core i7-4790K
Motherboard: ASUS Z97-A ATX DDR3 2600 LGA 1150
RAM: Crucial Ballistix Sport XT 16GB Kit (8GBx2) DDR3 1866
PSU: Corsair RM750
When I turn the PC on, the CPU fan turns on for about one second. Also, the EZ XMP LED(XLED1) turns green for a second. This happens about every 3 seconds until I turn off the PSU.
I disconnected all the drives and GPU, but that didn't change anything.
The only time when the CPU fan turns continuously is when I unplug the 8-pin CPU connector from PSU, so that only the the 24-pin MOBO connector is plugged in.
Trying to fix this, I got a new PSU (same model), but that didn't help.
Sorry if I missed any details. I will be happy to provide them.
Any suggestions on how to troubleshoot this?
Update: Sorry, I forgot to mention in the original post that I had cleared CMOS a couple of times. That didn't help.
Update 2: Again, sorry I didn't explicitly mention in the original post that all the USB devices (keyboard and the mouse) had been unplugged for troubleshooting.
Update 3: Got another motherboard. Installed the CPU. It works. So, it looks like the motherboard was at fault. Now the PC won't recognize the old Windows system disk, but that's another story :)