I have a computer with a Samsung SyncMaster 633 NW and Windows XP.
Now I updated my OS to Windows 7 32-bit. My driver CD was not compatible with it. When I selected the screen resolution, my monitor's name was SyncMaster and recommended resolution was 1360x768.
After some days, when I started my computer, the screen was flashing. I once more opened screen resolution settings, and my monitor name changed to "Generic Non-PnP". Changing the resolution didn't solve my problem.
When I boot into Ubuntu, the same problem occurs. The screen starts to flicker.
What to do? When I checked the monitor drivers, it showed "Device is not working properly" and location on NVIDIA GeForce 7025 / NVIDIA nForce 630a (Microsoft Corporation - WDDM).