It is possible you inadvertently disabled your notebook screen. There is a feature that lets you alternate between the internal screen and an external monitor/projector. This is used in presentations and docking situations.
To check - try this, in the lower LH corner of the keyboard, find the "fn" key. It is sometimes blue in color. Now locate the F4 key. You should seen a symbol on it that looks like a large oval with vertical lines on each side. Press and hold the "fn" key. While holding it down, press and release the F4 key. If you had accidentally disable the scrren, this should restore it.
If that is not the case. wait for the system to fully boot up. Take the unit out of direct lighting, but not into a dark room. Look at the screen from a slight angle. If you can just make out images on the screen that resemble what your normal display looks like, then what has happened is the the fluorescent backlight that make the LCD visible has failed. This requires a rather extensive effort to repair.
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It is possible you inadvertently disabled your notebook screen. There is a feature that lets you alternate between the internal screen and an external monitor/projector. This is used in presentations and docking situations.
To check - try this, in the lower LH corner of the keyboard, find the "fn" key. It is sometimes blue in color. Now locate the F4 key. You should seen a symbol on it that looks like a large oval with vertical lines on each side. Press and hold the "fn" key. While holding it down, press and release the F4 key. If you had accidentally disable the scrren, this should restore it.
If that is not the case. wait for the system to fully boot up. Take the unit out of direct lighting, but not into a dark room. Look at the screen from a slight angle. If you can just make out images on the screen that resemble what your normal display looks like, then what has happened is the the fluorescent backlight that make the LCD visible has failed. This requires a rather extensive effort to repair.