it may need factory reset.
Thanks for the reply sir . . . very much appreciated.
Actually ngayon ko lang nabasa yung reply nyo and hindi ko na ginamit yung monitor since the time I posted the problem.
Then nung susubukan ko na yung advice nyo, suddenly normal na ulit yung display ng monitor ko.
Thanks again for the advice. Next time na mangyari ulit i'll know what to do.
Thank you and god bless.