>Other idea is: when was the las maintenance done to your OS (scandisk, defrag, antivirus checking, delete unused files, cleaning recycle bin, etc)?
>Hardware maintenance?
>Last video drivers, or maybe someone make a change on your system.
>Check yout monitor signal cable. Do you have a voltage regulato closer to your monitor/computer?
>
>Hope this help
>
>Mauricio

Thanks, Mauricio. I hope I can get some help from our Network Administrator to check all these stuff.