I recently bought myself a new CPU. I have Windows XP Professional SP2 installed as my primary OS. The problem is, recently my monitor (Samsung Samtron 55V 15" which is 5 years old) has started making a whistling noise. When I start the computer for the very first time, it makes no noise. But after running the PC for about 15-20 minutes or so, when I start/restart the PC or run a MS-DOS program, the monitor starts making a whistling noise. After restarting, while booting it makes a whislting sound, but when it reaches the login screen, the noise disappears & there is no noise afterwards. Also, when I run any DOS-based programs in full screen mode, the noise comes back. But after going back to Windows or running the DOS-based programs in windowed mode, the noise disappears. All of the above said happens after running the PC continously for 15-20 minutes or more. I have checked all the monitor connections & installed the correct AGP & monitor drivers but in vain. Kindly help.