I have a MacBook 5,2 that I use on a daily basis to do work, read email etc. A few weeks ago the screen started flickering and turning off at high brightness levels. I could get the screen to turn back on by holding down the reduce-brightness key then holding down the increase-brightness key. However, if I set the brightness too high it would flicker and turn off again. The problem has gotten worse over time: the screen will only stay on for about 10 seconds at the lowest brightness setting. I have the MacBook hooked up to an external monitor now, with a USB mouse and keyboard, which is what I'm using to type this post. When it started happening I searched and found out about the inverter replacement repair. I ordered a replacement inverter and performed the repair. It took about 3 hours using this guide. However, the problem persists. What should I try next? Replace the inverter cable? Replace the screen? Are there services out there that can diagnose my problem for cheap/free? Edit: It's definitely a problem with the backlight, or the power supply to the backlight, because if I shine a flashlight at the screen I can see that the image is still there.