This has mainly been an experiment as the laptop was given to me two or three years ago. Originally, I had problems with the audio after updating to W-10. That was remedied by "force" installing a Sigmatel audio driver. And, THAT worked until Microsoft decided to "force" install a Microsoft driver. Which, I had to RE-force the Sigmatel again to get audio back. Prior to some recent Windows Updates, I could DISABLE any Driver Updates. Now, it seems, any setting that would work is hidden within the Registry. (OR, if anyone can point to a better solution, I'm eager to see it.) But, after the most recent Cumulative Update, something weird was going on. The main screen was blacking out after only a few seconds. It could have been anywhere around 10-20 seconds. And, it would do this even if I went into BIOS Settings to see if there was a problem there. So, I hooked up an external display and that display worked flawlessly. However, anytime I would make any display changes, e.g. via the Display app, to change, say, resolution, the MAIN Screen would flash on and off. I was pretty much about to reside myself that this old laptop was about to become a paperweight. UNTIL.... After sitting a couple of days, I started it up again and, for several hours it has performed without going blank again. (By this time, I had disconnected the external display.) Whether anyone has any idea as to what was going on or not, it's not that important. I'm sure I'm going to get a newer laptop sometime in the near future as this one is quite old. But, at any rate, feel free to comment if there are any questions or suggestions as to what gremlin had possessed this unit ... at least for a brief period of time. BTW, it originally came installed with Vista.