Vertical Monitor Turning On The PC, My Monitor First Shows Colourful Vertical Lines And Then Goes Blank?

Turning on the PC, my monitor first shows colourful vertical lines and then goes blank? - vertical monitor

Recently, when I my computer screen displays colors and vertical lines, the gray go after about two minutes, works as usual. When turned on, work and have no problem, even if you turn your PC.
The moitor PC and both are about 1.5 years.