Laptop is not starting up.

[Mushfiqur_Rahma]

I can not start my notebook.I have tried power reset but its not working.

My laptop has sealed battery,I have replaced it but still nothing on the screen(LED light is still off but Power light is always on).

It starts up sometimes and works properly. So I can assure that my AC Adapter and Battery is good.But whenever I turn it off ,I can't start the laptop again.I have to wait until the laptop starts suddenly by itself. What should I do?

[WAWood]

@Mushfiqur_Rahma 

Win10 has enabled a new hibernation process known as Fast Startup -- which is enabled BY DEFAULT. This is different from Fast Boot, which is a BIOS/UEFI option.

Fast Startup is supposed to dramatically speed up the booting process, but in some PCs, it actually slows it down or causes it to hang. It's also a new form of hibernation known as hybrid sleep -- and this causes battery drain to maintain the state of the PC while turned off.

Disabling Fast Startup might fix booting and shutdown problems.

There are two ways to disable FastStartup in Win10: (1) through the Control Panel, and (2) through an elevated command prompt.

Control Panel - Open Control Panel --> Power Options.
Select "Choose what the power buttons do"
Select "Change settings that are currently unavailable"
At the bottom of the Window, under Shutdown settings, uncheck the box regarding fast startup

Elevated command prompt - run the following command:
REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Power" /V HiberbootEnabled /T REG_dWORD /D 0 /F

In both cases, reboot Windows.

NOW, FastStartup is disabled.

See if that helps.

[Mushfiqur_Rahma]

I did as you advised me but it couldn't help.Still my laptop having problem with start up.I can't start it.Is it any hardware issue?I don't think so.Because my battery and AC adapter are good.There is no problem with them.But I am not sure about the CMOS battery if it working or not.Every time when the laptop started,date and time was not correct.

Please help what should I do now?

(Sorry for responding late.My laptop took 7 days to turn on again by itself.)