My MacBook Pro doesn't turn on unless it's connected to wall

hi,

i've got macbook pro 13" mid-2012 standard configuration , strange thing happen:

- i'm unable turn on computer unless mac connected wall.

- press battery indicator button , nothing happens.

- has battery

- power button ok

- connect computer wall , i'm able turn on power button , battery indicator button shows level of charge.

- when computer on, can disconnect magsafe , it's ok.

- if turn off computer being disconnected wall , try turn on, unable so, forcing me connect magsafe , can press power button , works.

be?

thanks.

 

check battery if it's normal, smc rest , if not have laptop checked

 

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