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What's DOS?
Posts: 1
Registered: ‎06-28-2018
Location: PH
Views: 409
Message 1 of 2

LENOVO S400 not turning on



I need some help because I am torn on how and why my laptop is not turning on-- maybe battery, Ac or some hardware problem. model is s400



1. when battery is used it charge to 5% only and will stop charging, then a moment later it will show a low bat sign and will shut down.


2. when I remove the battery and connect the ac adaptor directly, no sign of power light and the unit won't open.


Pls help me with this.


Sr Support Specialist
Posts: 9,267
Registered: ‎11-30-2015
Location: PH
Views: 375
Message 2 of 2

Re: LENOVO S400 not turning on

Hi Mss2019,


Welcome to the Community Forums.


The hardware mnaual shows user steps to check power issues here on page 21-22. This would help isolate ac charger issue against battery and systemboard/ internal part.


If a known good charger do not work then it would be best to check internally, starting with the DC port going inside the laptop. You may need a board technician that is skilled to map the fault it it comes with system board failure.


If there is a known good battery with at least 50 % that is able to make the machine boot to Windows then we isolate the problem to be limited on the how it recieves power (adapter / dc in port/ power board and cable).


I hope this helps answer your query.

Update us how it goes.



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