突然中斷無畫面應該係顯示卡(Display Card)出現問題，亦有可能係顯示器(Mon)內部零件老化。

問朋友借個Mon接上你部電腦檢查是否正常，如結果是一樣的話，相信是Display Card已損壞了。

Use strong light to shine on your monitor. If there are some bare seen image
on LCD mon, then you backlight is dead. Try to ask the price for changing the back light or just buy a new one.