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If it's a newer tablet it should be rechargeable. And a red battery light indicates the need for it to be charged. On one of the side edges of the tablet there should be a micro USB or other port for a charging chord to plug into.
There should be a tiny reset button or pinhole (use a straightened out paper clip). If reset button/hole itself does not work, try pressing it while holding down the power button at same time. Otherwise, it sounds like you have a battery/charging issue (try another charger cord if available).
Right click on the computer's destop and view the display properties. Under the tab where you can alter resolution you can manage multiple monitors, It sounds like your laptop is setup to display through it's external VGA by default. Click on the two squares it shows and try to set your main screen as default.
You should angle the screen towards the light to see if you have a faint image on it. If so, the problem is more than likely a failed inverter, or CCFL lamp on the LCD itself. Either in which would have to be replaced. The CCFL lamp unfoutunatly part of the LCD it self and cannot be replaced seperate the screen. The inverter can be replaced easy as it it right under the screen. Symtoms of a failing CCFL could be the white comes out as red on the screen for the 1st 10 sec or so of startup. This will put alot of stress on the inverter causing the inverter to overheat and shut off. I have one to where the CCFL failed and am trying to find a replacement. Good luck