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Remove the battery and power source. Remove the RAM and hdd. Power up with the power supply and it should do something. If it does, replace the RAM and hdd it should now restart. If nothing, check the GPU.
Power the unit off (holding power buttom) and selecting Power off, then simultaneously hold the "back" button and on button for about 8 seconds. When the android icon appears, press back buttom, in the menu select wipe data/factory reset pressing the home buttom and then press the back buttom, in the next screen select "yes delete all user data" pressing back buttom, and in the next screen select "reboot system now" with the back buttom and wait.
You placed your problem with wrong category, I assumes. Is it a projection TV or a laptop? If it is a TV; check the site linked here for one color predominant screen faults. If it is a computer, re post your problem by computer category. http://electronicshelponline.blogspot.com/
If you have a Windows OS, press and hold the ALT and CTRL (control) keys and then press the Up arrow. (If that doesn't work, try holding the Alt and CTRL keys and pressing the left (or right) arrow key twice.) If that fails, right click on the desktop (Windows+D will minimize all programs), anywhere with no running programs or icons. Then select the Screen Resolution option. Look for the line Orientation; use the drop down menu to select the correct orientation. Click Apply and then confirm the setting change if a confirmation window pops up. (This works in Windows 7 and 8.) For older Windows versions on laptops, you may need to select Graphics Properties (or a similar line) and then repeat this. The Windows screen rotation option is dependent on your video card. With some models, you'll need to open the graphics card properties to undo the rotation. You should see a line for the graphics adapter when you right click on the Display.
For Macintosh OS, make sure that the System Preferences is closed. Then open it by pressing Option/alt + CMD . Select the line Display. Find the button labeled Rotation: Standard then choose the correct screen orientation.