Here are three methods that can help you make your screen light up again. The brightness of your screen becomes so low that it hurts your eyes to see things on the screen. Windows 8.1 How to turn off auto brightness
It happens usually after you accidentally press a wrong key or you finish updating your operating system. If you are a Lenovo laptop user, you may have encountered a very annoying issue that the screen of your laptop went very dim. He believes technology should bring users satisfaction, not annoyance, so he writes to help people overcome their tech troubles. The issue means you have a bad part in your machine (which is at best going to limp along, at worst, going to get worse or fail-probably the day after the AppleCare runs out).Jonny, a Microsoft Certified Professional, is a technical writer and technology enthusiast. Unsolicited advice to previous posters who've noticed this problem: if you have this problem from time to time and you have AppleCare I'd take your machine in.
(I recall when I had a hard drive installed on my old iBook, the Mac place that did it charged me about $80 an hour just for the labor) I don't know if you can buy AppleCare for the MacBook now (or if Apple'd be suspicious if you bought AppleCare for an old computer and then brought it in for repair the next day) but if you could, it might be cheaper to do that than to take it someplace to get it repaired. But again, this machine was still under AppleCare so the repair was free. They had the part, so the repair took about 5 hours. They had to replace the inverter thing that is located inside the hinge part of the MacBook. The Genius guy said that this was a known issue and that it usually resulted in one of two things: what I was seeing, or a constant wavy brightness on the screen. I have AppleCare (through next February), so I went online, booked a Genius appointment, and took it in. The trouble I was having was maybe once a day, the screen would go black for about a quarter-of-a-second and then come right back on. I just took my MacBook in for this problem last Friday. MacBooks all have that magnetic cord connector thing, so there's no real cord jiggling to be had-the cord's either firmly plugged in, or firmly not. Want my guess? You are, inadvertently and without knowing it, jiggling the power connector.
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