Samsung Evo 860 SSD booting intermitently

@TOYMINATR
Sorry for threadjacking
@ mods please advise if i need to make a new thread

Some update after feedbacks
- placed old HDD
- set boot to uefi first -> missing MBR
- set boot back to legacy support
- system boots OK
- shut down system via start button -> start boots OK
- restart system via start button -> system boots ok

@bro67 seems that mobo is fine, maybe ssd is then not
@NAVYCLDR thanks for pointing out

But, i do see difference in how 1st partition is named
old HDD names it system reserved



Any more ideas are welcome

Fixed the problem.

I wanted to let everyone know what I did to resolve it.
Turns out it was a hardware issue. I replaced the Gigabyte mobo(6 years old) with a new Asus board and a new AMD processor.
This solved ALL the above mentioned problems. What made it so confusing is that the problems started when I first installed the new SSD using the old board.
Anyway, thank you guys for chiming in and offering suggestions. Hope this helps somebody else.