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i have a macbook pro 2012 that is showing no image on the screen with no backilight and if an external monitor is connected and i go to about this mac > Display it doesnt show up to the system Please help i need to fix it asap

Sounds like you have some liquid damage to the logic board at the location where the internal display is connected. You’ll need to open the system up to inspect the connections for damage. Follow this IFIXIT guide to Step 4 MacBook Pro 13" Unibody Mid 2012 Logic Board Replacement. Then jump down to Step 15. Does your connector and the solder joints look like this:

If not you’ll need to do some cleaning and you still may need the logic board repaired or replaced (as well as the LVDS cable to the display).