Hi Mouldread,
Thank you. I forgot to mention that I can't see anything in the monitor because Windows 10 doesn't let me go back to previous hardware configuration. I can feel the OS is booting up. I only see in a black screen with (D-SUB, OUT OF RANGE, 84.6KHZ/75HZ) in the center. I tried to boot repair mode but I don't have a back up disc. F8 doesn't work in Windows 10 for safe mode. I can see F9, F10, f12. It is just not showing the desktop because I changed the resolution from 65kHz to 75 Hz.