Question Thinkpad L420 Shuts down after update

[maneyrocks]

My lenovo Thinkpad L420 shutsdown few minutes after booting . I recently updated it to windows 10 because wifi drivers were not working when it was on windows 7. Now after update it boots perfectly and after a few moments it shutsdown, tho it doesnt shutdown if you didnt unlock the screen. then it stays on for all the time. i tried a lot of methods but none worked so far, A bit of help is required.

 

[rgd1101]

doing windows update?

 

[maneyrocks]

doing windows update?

No. Fresh install

 

[rgd1101]

No. Fresh install

I mean is the laptop doing windows update.
fresh install don't mean it have all the latest update.

 

[maneyrocks]

I just downloaded the iso from website. Also laptop stays on on lock screen. But shuts down after one min on password entering

 

[rgd1101]

hard shut down or go thru the shut down process?

 

[maneyrocks]

hard shut down or go thru the shut down process?

it just snaps to shut down, like power cut or battery dead condition.

 

[rgd1101]

so hardware issue.

 

[maneyrocks]

A friend of mine has the same laptop. He also has this issue. Can this issue exist. I mean if you dont unlock the screen, then it stays on for hours and hours, but unlock it once, and it immediately shuts down