[mothered]

Also try resetting the bios to factory defaults.

Further to this, pending on availability, update the BIOS to the latest version by downloading It via the manufacturer's website.

Unfortunately, It Is a trial and error/process of elimination scenario until you can pinpoint the Issue.

[Yung Lean]

It may be the boot sequence. I guess most of you would not have made that conclusion.

In what order boot serquence must be? I checked on internet and mine seemed to be alright.

Oh yea, a lot of operating systems can screw up like that too. Like my laptop has the same problem with Windows 7, works roughly with XP (wut?), but Linux works beautifully.

Software and boot sequence could play a major role in this, try Linux on a USB stick and report back and maybe it could help!

Well it does same
with Linux installed Win10 and Win7 and Win8.1 still same problem but haven.t tried Linux Live USB to see if it turn off so will try that.

Hmm. Might be the power supply. Try a different one, if you have one. Also try resetting the bios to factory defaults. If that doesn't work, post the exact model number of your laptop, and I can try and help you find replacement parts if they are available.

I tried different power supply.. First thought was thats something with power supply so I changed it but still wasn't working.
I did reset BIOS to defaults but still same..
By the way laptop is Acer Aspire 6935