why my laptop fan acer 5742z usually stop

trucnguyen
trucnguyen Member Posts: 1 New User

i have an acer laptop 5742z , its fan usually stop and run , and about 1 hour later laptop suddenly power off, i've checked the fan it good when it is connected directtly with 5v DC power, but if connect with mainboard, this happen usually, would you please help me?  

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