MONITOR DISPLAYING MANY VERTICAL LINES OF MANY COLORS

You have eliminated the CPU/Video card as a problem so you should try changing the video cable.
There is a good chance that the cable is bad if the multi-colored lines you are describing is the "test pattern". So swap out the cable and see if that fixes it. If that doesn't fix the problem and the monitor won't work with another CPU, it looks like you are going to need a new monitor.

hi

if your getting vertical lines in you screen it means you have problem with screen you have to go to services center

this is display issue

this usually means that the display is broken. i'm sorry to inform that this can only be repaired by replacing the LCD module, which costs quite a lot of money (an estimated 60% of the price for a brand new laptop)

Have you unplugged the power cord to the LCD? Let it sit for a minute, then try it. ALWAYS buy a UPS and plug any computer devices into it. Doesn't have to be big, a $50 unit will protect it from dangerous voltage surges.

Check that the signal cable from the computer is firmly connected and that there are no bent pins in either end. If the trouble continues, the problem is in the monitor itself. Given the low replacement cost, it's uneconomical to try repairing these.

Vertical IC loose connection. Best is to reflux it or resolder. It is in internal circuitry inside the monitor commonly an upside single line IC.

And its a minor repair only. But I recommend it to be serviced by a qualified technician. Inside it are plenty of nasty voltages. It might caught you.

replace the monitor: it's lost vertical scanning

What position of a single rose color line? Is it vertical line or horizontal line?

The white screen tells me that the display cable (inside your monitor) may be unattached or broken.
The color bands if they are vertical or horizontal lines tell me that your display cable needs to be replaced.

So overall replace your display cable. If this doesn't entirely fix the problem your logic board (inside the monitor) needs to be replaced.

could be the vga car4d problem, try to hook up with another pc if the problem remains then unfortunately the monitor is dying.