My laptop is black screen when i turn it on

Hello,
May i know why my laptop is in black screen when i turn it on?i just change the mother board for my laptop early of this month..FYI i'm using qompact the brand of my laptop..Plus i can't used battery only using the power cord..can u guys help me?
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More about laptop black screen turn
  1. check the video connection, inverter might be bad so there is no backlight, try using another external monitor to see if it's just the screen on the laptop or if it's the video in the laptop. as far as the battery not charging, you may need a new battery or the charger your using is not the proper volts / amps to charge the battery.
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