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Firstly - Is the cabling, mains and data cable, securely attached at both ends and the power turned on at the mains?
Secondly - If so when you press the monitor power button, does a light come on? (often orange coloured) If yes does this change colour when the computer starts its boot sequence? (often to green or blue)?
If no light can be obtained it is likely that the monitor is faulty.
If a light comes up on power up, but doesn't change colour during the computer boot sequence then it is more likely to be the graphics card that is faulty, or sometimes the computer PSU.
The easiest way to find out whether the computer or monitor is at fault is to replace the existing monitor with a monitor that is known to be in full working order, for example from another computer. (Or connecting your monitor to a computer that is known to be working)
Having isolated the faulty component it can be replaced and you should be up and running again.
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Below are the top reasons why there are "colour bars" running across the screen :
Corrupted video driver
Changes in hardware configuration (display)
Monitor issue (hardware)
In order to determine
if it's hardware/software issue, all you need to do is to boot to BIOS
and check if the problem replicates. Depending on system, you can go to
the BIOS screen by tapping "F2" or "DEL" key repeatedly as soon as you
turn on the computer until you see a different screen.
problem is present while in BIOS, then definitely the monitor needs to
be repaired by an authorized repair center. Otherwise, video driver
update or Operating system re-install can resolve this problem.
Your monitor is sensitive to magnetic interference from your pc speakers, place them away from the monitor at all times then the montor should go back to normal within a few hours or so. you could try to degause it every couple of hours or so but this will not totally fix the problem, leaving the monitor switched off for a period should work better.
A distinct possibility would be a resolution error in the operating system. Try booting in "Safe Mode" (I assume you use Windows), and see if it works. If it does, change the resolution to something safe, such as 1024 x 768 by 16 million colours (24 bit), or even lower. Then boot normally. At that point, increase gradually the resolution.
I was just dealing with this last night. My pc would come on, but I kept getting a "No Signal" message on my monitor. I first plugged the machine into a known working monitor. It worked fine so that eliminated the video card issue. Then I plugged the monitor into a different computer...it too worked. So I knew that the monitor was good. I then switched the cord from the faulty monitor and still didn't get a signal. I proceeded investigating the issue. I found that if you boot the machine in safe mode, it actually caught a signal. So...I figured it must be something to do with the resolution. My solution: Boot the machine in safe mode, change the resolution in the control panel and reboot the machine. If it doesnt catch the signal booting in safe mode, I suspect it is a faulty video card. You are likely to find what you are looking for online at zipzoomfly.com or newegg.com
First try to do monitor self test.Disconnected the blue cable VGA or white colour connector from monitor to the computer. Turn on the monitor and check if you are able to see colours or line on the monitor.Indicating self test monitor is working fine. If you are using Video card on computer connect monitor directly to onboard video and check. Good Luck.
The screen colour changing is apparently an auto test procedure on the monitor and was prompted by a fault with the monitor not automatically shutting down when the computer is shut down. The settings on the monitor have been adjusted to rectify this and the problem is now gone.
What operating system do you use? If it is a windows OS press F8 while the system is booting to access the Boot Manager, choose to boot to last known good configuration and if this does not work retry but select safe mode and change the resolution back to the previous one.
Do you have your screen saver enabled, i so turn it off and se if it still does it.
Secondly boot your pc in safe mode(pressing F8) on boot up and select start windows in safe mode.
See if the monitor still does it, if so a monitor fault or loose/faulty vga lead.
If it is ok then your graphics driver may be corrupt and need re installing.