motherboard - computer not starting at all after connecting sata drive

I built a "new" computer using my old i5-4590K processor (socket 1150). The motherboard is Asus H81M-K, new board , with 4 sata ports (2xSATA6GB + 2xSATA3GB). I have assembled my own computers since year 2000, also I am not an expert.

All was working fine for 24 hrs with the following components:

• 2 corsair XMS3 DDR3 1600MHz 8Go RAM = 16 Go


• i5 4590K (not overclocked)


• asus nvidia 1050Ti 4GB


• coolermaster 450W PSU


• SSD Samsung EVO 840 512Go (on SATA-6GB port 1)


• DVD-Bluray player LG (on SATA-3GB port 1)

Then after turning off, unplugging power, I connected:

• HDD Western digital caviar blue 1TB on sata-6GB port2 - drive almost new.


• HDD Western digital caviar green 2TB on sata-3GB port2 - drive used for backup only.

Then:

• the computer didn't start, just the green led on the motherboard apppears. No fan, no noise.


• If I remove the two hard-drives, same thing.


• I tested another PSU: a new cougar 600W VTE600 PSU. Same problem. I tested the old PSU connecting green wire with ground and the PSU working fine too. So, it's not a PSU problem.


• I made a clear CMOS and removed/put the battery in place. The battery has 3.1V.


• I removed all components (graphic card, use only one RAM module, removed all drives), same thing.


• I put the motherboard outside of the case on an insulating material, only with CPU, cooler and RAM. I bridged the startup pin with a screwdriver, nothing start or move. Only the green light on the motherboard is on.


• I tested both hard drives with an external dock on my laptop and they work normal.

Any idea? dead motherboard upon connecting sata drives? how is it possible?