Too dark brightness gradation

Hello

The brightness of my 4-7 month old Windows 8 Sony Vaio E Series 14 p is too dark gradation without changing settings. It gets really annoying because it's happened for about 6 to 8 weeks. I'll change all options power plan forever, even to restore all the advanced power options and set the bar to 100%, but the full possible brightness for a few seconds then dim up to 10% or 0%.
Haven't tried the ringtone Sony or Windows but if none of the above work not, I have them ring. Just a little more info... I installed all available updates check at least once every day more. Another parent has a windows 8 Acer and I compared my settings to their and clicked on save, but nothing happened.
Please help with my other with Microsoft Office 2013 not opening ' because it's another problem I have on the same PC, but recent responses have failed and I do not want to uninstall Office and reinstall because of documents etc. that I created.
Help, please.
Alyxlm

Hello

I want to check if the brightness works even if the power supply cord is connected to the laptop?

This problem may occur if the graphics driver will not work correctly.

Go to Device Manager to check the make and model of the video card driver. Based on the use of the brand and the model this link to download and install the drivers. Now, check if that corrects the problem.

To access the Device Manger, follow these steps:

a. press the Windows key + R type Devmgmt.msc and press on Enter.

b. check the name under display drivers.

For the problem of Microsoft Office 2013 please post your question here: http://answers.microsoft.com/en-us/office

Please post with the State of the question.

Tags: Windows

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