|It would appear English isn't your first language.|
Your lack of literacy in English makes you very hard to understand.
Assuming I've understood you correctly.....
If this is a desktop computer and you've already tried another monitor that you know for sure works, then it's likely the video is dead. Check your motherboard spec's first for what type of video slot your computer has and then buy a video card that will fit.
If your existing video is onboard, disable it in the BIOS before booting with the new video card in place (ie: after you install the video, on first boot go into the BIOS and disable the onboard).
If your existing video is a card, remove it and replace it with the new card.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.