Hystou FMP06-i3-5005U no more working

[stepmelo]

Hi everyone,,
i bought 3 months ago a miniPC Hystou FMP06-i3-5005U FANLESS from gearbest.
It was working amazingly good for my need, at about 60°C internal temperature as its aluminium case is sufficient to radiate dissipation even under heavy load.
2 Weeks ago, it didn't turn on again (blue led light for one second and then no booting) and it seems to happen often according some different forums.
I don't want to send it back to china as its price was quite reasonable (200E) and as i could reuse RAM/SSD/supply and this aluminium case.
Do you have any advise of a cheap motherboard with processor that i could buy, to reuse all of that (even with a lower performance), problem would be to have similar interface with case hole and so on.
Or any idea to identify the reason of this bad switch on (i've already dismounted it and did'nt find any burned electonics or bad connections...).
Thanks a lot

Regards

[trebor]

Power supply maybe, Ram or SSD can test with other ?

[stepmelo]

Thanks Trebor,
i've tried to change each one of them without results, i've also dismounted the motherboard to ensure the contact of the proc i3 and the case was good (some forum was describing some potential excess of thermal grease that could lead to shortcut), but all of these are good...