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Why my laptop shutdown by itself

#1 why my laptop shutdown by itself. When my laptop was on it never charged the battery and the low battery beep was on even if its charged.When I off the pc and charge it the battery charges well.In some days I reinstalled the windows formating all the drives so to get a clean hard disk..It worked well for 1 month.Now what i have got is that when the pc is off there is no interference of any OS routine or any software which is involved in charging of pc so it charged well while it was off.But when I power on the pc and the software executes it halts the charging.I guess there is some problem with the execution of software halted by some virus which didnt allow my pc to charge while it was on...My problem was completly solved when I reinstalled the windows.Now after a month, the same problem rises up, pc gets offf whether having a battery or not...I conclude its a viral issue to pc orrrr over heating is also a major major cause.....

#2 why my laptop shutdown by itself
solved 

go to
DEVICE MANAGER
NETWORK ADAPTER
right click than PROPERTIES
tab ADVANCED
skroll to WAKE FROM SHUTDOWN
OK

thats it

# From yahoo answer : Is is shutting down while you are using it, or when it is sitting idle? If it is when you are using it, you will need to take it for service. If it is when it is sitting idle:
right click on the desktop, select "properties", hit the screensaver tab. In the "power" section, change the settings so it won't shut off when idle.


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