hi friends,dell n1510 turns on after shut down in windows.
1-Fresh o.s re installed.
2-bios updated(after bios update in windows it shuts down normally,but after switch on again,the same problem..)
3-cpu changed
4-kbc and southbridge changed.
Is there any shut down sequence?
Any offer please?

Check the power button.
perhaps sticking...

Open schematic and make a revision for power sequence