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usually with AIO they have very poor life due to lack of ventilation and heat... if you have done a reset and screen is the same it just means that your screen has been affected by heat and it will no longer work the same. it could had been worse some other pcs the video card just gives out and you have nothing left! hope it helps.. its time for an upgrade!
Lenovo typically uses F11 (dim) and F12 (Brighten). Or, if you are running Windows 8, move the cursor to the lower right and wait for the menu. Select SETTINGS, and you will see BRIGHTNESS button on the SETTINGS screen. Click it and adjust it.
Your laptop button functionality will not work until you install the drivers necessary. Check online for the drivers and make sure that all of your drivers are installed in device manager. To get to device manager, right click computer and click manage. In the sidebar, go to device manager. I'm not quite sure if windows 8 has a software slider... it should be under power options where you can adjust the screen brightness to save battery. Good luck
boot to the BIOS (F2 at boot) and ensure that the LCD brightness is set to 8 and then reboot, if LCD is still dim, then, check the Control point system manager display settings and see if the LCD is dimmed there.
If no change, run diags Power + D at boot to run the LCD BIST test , if the 4 colored screens are DIM during the test, then the LCD has failed and needs repplacement.
Good Morning! With the 8 years operations of your emachines monitor, some of its electronic parts might incurred cold solder joint connections from its circuit board & possibly some of its Capacitor parts are already worn-out. please try to get assistance from an electronic service technician which will surely diagnose & repair the problem. best regards.