Question MSI Z170A not POSTing, only a blue light ?

Mar 3, 2021
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Good morning, I have a pc which I got second hand from a friend. He got a new pc about a month ago. At the time, the pc I got worked perfectly, but now It doesn't POST at all. I have re-seated everything, from the CPU to the ram. If I hold the power button for ~10s a blue light comes up. Other than that, I am not sure what I should do. This is the video of the blue light here.
PC Parts:

Mother board: MSI Z170A
RAM: 2x8gb kit. 2100 mhz
PSU: 550watt lite power.
CPU: I7-6700k with water cooling.