I had same problem on my Aspire 8920g in 2013. Just want to share my solution. oldturkey03 is right that the problem is with backlight. I solved it in two steps. Starting with easiest. First - replace inverter, in my case the problem was still there, but for some users it can be solution. Second - replace LCD CCFL Backlight. This step is more difficult, but with patience and skilled hand it is less than 2 hour job. To change CCFL is cheaper than whole screen. You can find them for under $20, just search eBay for "LCD CCFL Backlight Aspire 8920", example eBay link I did this repair in 2013 and still PC is working without problems.