Scceen flickers on and off

Hi hope your monitor issue has resolved. I would suspect the problem is a hardware issue then a software setting. Since the monitor is over three and half years old, if your monitor is a LCD with CCFL back light and had been used almost every day, there may be 3 possible hardware issues. First is the internal power supply, that can go wrong due to heating problem within the monitor, this problem usually cause the monitor to display poor quality picture and may show interference lines on screen prior failure. Secondly, it may be the inverter that drives the back light, which may fail due to the safety circuit kicks in, because it involves with high voltages. Thirdly it may be the backlight itself, which is like most compact CCFL energy saving lamps that flickers or turn itself off when it reaches the end of its service life. This problem usually caused the monitor to show redness or yellowness images prior failure.

All of these can be resolved by qualified electronic repairers, all the best.

please check the monitor or LCD that you have. because the computer will not flicker if there is a problem on the display. isolate it. use other monitor or LCD then check if it flickers again.

You need a new monitor!

if you have no image on the monitor when you hook monitor to other pc and you installed the video drivers for monitor and still no image then you got either a bad power cable for your monitor or your monitor is shot...get a new monitor... try testing again with a different power cable... if still the same... then monitor is shot... replace it...

I’m happy to assist further over the phone at https://www.6ya.com/expert/norman_d2fa496dce30c65d

The high pitch sound is coming from the inverter. It is faulty and needs to be repaired or replaced. The inverter supplies high voltage to the CCFL lamp, this lamp gives the backlight to the LCD so you can see the LCD images.
Check out LCD parts for parts, service and DIY info. use this link :-
www.lcdparts.net

The "image" you are talking about: Is it there when the monitor is off? If so, you are correct--it's broken and must be replaced.
Is it on the desktop when you start the computer and does it stay there no matter what program you are running. If the answer is "yes" then I'm afraid the answer is the same.

You may need to check your desktop image for your monitor and change it to something lighter
The external monitor usually uses your computer's default and not ncessarily the one from your laptop monitor

Without taking it apart myself, it could be some wiring from the laptop to the screen

Good morning, Kevin!
Sounds like an LCD problem. You can verify this by hooking up an external monitor. The external monitor will probably show a good display.
After verification of the problem,you may want to try to replug the LCD cable at both ends, just to see if that corrects the situation.
If that resolves things, all is well and good. If not, you may need a replacement LCD.
If the external monitor shows the same display, you may have a motherboard problem.
Hope this information is of some help.
Ron-

it is not monitor problem as it is showing desktop. there is problem in setting of monitor or monitor Configuration is not proper. please refer manual which you must have received at the time of purchase.