After power on, it can't work

I have a MacBook pro, 3 year of age.
I switch it on and after the display is black but the fan work.
Probably is the mainboard, someone can tell me how much does it cost repair it?
tanks!

Amrit M wrote:
my iPhone is not turning on... my power button is compressed
Looks like a Visit to an Apple Store or AASP (Authorized Apple Service Provider) is required...
Be sure to make an appointment first...

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