How to fix LCD backlight if it doesn't work on Acer Extensa 4120 Laptop?
If the LCD backlight on your Acer Laptop isn't working, the screen is too dark, or the brightness/contrast cannot be adjusted, enter the BIOS Utility and execute “Load Setup Default Settings”. Then, reboot the system.
What to do if there are errors in checking the power adapter of Acer Extensa 4120 Laptop?
If your Acer Laptop displays errors while checking the power adapter and the voltage is incorrect, replace the power adapter. However, if the voltage is within the correct range, the system board should be replaced.
What to do if memory errors might stop system operations on Acer Laptop?
If memory errors stop system operations, show error messages, or hang the Acer Laptop system, boot from the diagnostics diskette and start the diagnostics program.
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