I had connected my laptop to an external LED display in the office on Windows 8.1. Before connecting the laptop, my display resolution was 1366x768 which was normal. Even while it was connected to the external display, the resolution was normal. I don't remember how I disconnected the display serial cable and put my computer to sleep that day. Maybe I just pulled the serial cable plug and closed the lid on my laptop. The next morning, I noticed that the display on my laptop was reduced to 1280x800 with refresh rate of 59Hz. I don't remember my refresh rate with 1366x768. There was no option to increase the resolution as there is no resolution beyond 1280x800. I have tried uninstalled the Intel graphics driver. Rebooting in safe mode and uninstalling the driver in that mode and restarting in normal and reinstalling the driver but none of it has helped. I upgraded yesterday to Windows 10 in the hope that my resolution problems will probably go away but nothing has helped.
At the moment, I have a 1 inch gap on the right portion of the screen. I have reduced the resolution further to 1280X768 because otherwise I cannot see the Windows taskbar as goes beyond the screen on the bottom. Reducing the resolution and center aligning the screen through my Intel Graphics Control Panel enables me to see 80% of the Windows taskbar at the bottom. At the top though, there is now a 0.5 inch gap because the screen has been center aligned. If you don't center align it, the screen sticks to the top but from the bottom, it cuts off.
On right portion of the screen, the gap doesn't go away. It stays black. Even in BIOS, the screen is like that. It's cut off from the right and extends beyond the screen limit on the bottom.
What do you think is wrong with it? Do I need to replace the LCD on the laptop or does it look like a software problem?
OS: Windows 10 and Windows 8.1 Laptop Model Lenovo Ideapad Z580 Inbuilt graphics card Intel HD 4000 - active NVidia Geoforce disabled Total Memory: 16GB