my laptop goes sudden off without any warning i have checked it through repairing centre it has no heating problem nor hard di

[Sandeep Mehta]

my laptop goes sudden off without any warning .........after that if I on again it open normally.
It has no heating problem....but I installed new motherboard can it be a couse of this problem it it is then suggest what to do....

 

[CapyWarrior]

If the problem started right after the installation of the new board that would seem to be the cause of the problem. It could either be the board itself or possibly a component got plugged in wrong or a loose part intermittently causes a short. Am I correct with the time-line here?