Thank for contacting Fixya, I will be glad to assist you. You cannot, without having a diagnostics performed by a certified Apple technician or Apple Authorized Service Provider. You may have damaged the video graphics card on the main logic board of your MacbookMacbook Pro.
Unless you have knowledge on how to go in and physically troubleshoot this geniune hardware issue, I would recommend you do you to your local Apple retail store Genius bar, or Apple Authorized Service center near you and have your Macbook looked at.
Just for your reference, I have taken the liberty to provide the store locator links to your local Apple Retail store as well as a general store locator for locating any local Apple Authorized Service center in your area.
Apple Retail Store(Genius bar - need to set appointment via this website link, if planning on visiting Apple store of choice in your immediate area)
Apple Authorized Service ProviderYou don't want to keep turning on the Macbook until you have it checked because it could affect more than just the video graphics card.
Regards,
-The MacTechTrainer.
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