If I hit Fn + F8 key in “Safe Mode,” it seems like laptop is switching to external monitor and laptop screen goes blank, but my external monitor does not show anything. But I do get a message generated from external monitor says “input is not in correct resolution format” of something like that. Certainly, when I’m in regular Windows screen, the Fn + F8 key does not work at all. What seems to be wrong here? My laptop monitor also flickers and goes totally black in about 3 – 10 minutes in regular windows, but works fine in “Safe Mode” and in Linux Live CD.
Inspiron 9400
Thank you,