Everytime when i turn on my computer brigthness adjust display appear on my screen, how can i remove this?

It appears to be a known issue

Fix 1: Hard reset your laptop
Remove the power, hard drives, the battery and any attached peripheral devices. Press and hold the power button for 60 seconds and release. Put your battery in and plug the charger. Then don't plug anything else.Nov 20, 2019

[Solved] HP laptop black screen - Quickly & Easily - Driver Easy

Sounds like the screen voltage is too low than normal. Try to adjust it a little more, by turning the potmeter for screen adjustment. This potmeter can be located at the LOT, will be marked as 'Screen'.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

If you havent restoration point you might reinstal windows and if its an illegal version never instal media player and i.e. update

Although your Toshiba portable computer appears to be on and running, there is no image on the built-in LCD display screen Look closely at the LCD display screen. If you can see a faint image on the screen, the display screen's fluorescent backlight may be turned off. Shining a flashlight directly at the screen will make it much easier to see whether or not there is a screen image actually present, though not lit up. On most Toshiba portable computers, there is a small plastic or metal pin near one of the LCD display lid hinges. When the display lid is shut (closed), this pin is pressed against an internal switch which turns off the backlight, saving battery power. You may be able to turn the backlight on again by tapping this pin repeatedly. The normal screen image will then suddenly appear, or re-appear.If there appears to be no display image at all, the problem is probably not related to the backlight. In this case, press and hold the Fn key and then press the F5 key several times, pausing several seconds between each keypress. This will cycle through several display output modes: Internal, External, Simultaneous, and possibly one or two more.If no image appears on the LCD display after cycling through the Fn-F5 sequence, try doing so with an external CRT monitor attached, if possible. If you still see no image, on either screen, try restarting the computer with the CRT monitor connected.If you see a screen image that looks normal when the computer is first powered on, or when you try to enter the BIOS Setup during the power-on sequence, it's an indication of a software problem (a driver or an application that's launched while the computer is loading Windows, possibly). Try downloading the display drivers for the computer from the Toshiba Support website, and then re-installing them.If the LCD screen or an external CRT monitor is blank only while the computer is first powered-on, but then works fine, it's probably not an indication of a problem. Some models display no text or images during the startup process. Additionally, installing some Windows Updates may delay the appearance of the familiar Windows desktop.If there are blank margins bordering the image on the LCD screen, launch the Windows Control Panel, then double-click the Display icon. Click the Settings tab, and then adjust the Screen Resolution setting until image fills the entire LCD screen, which will cause the margins to disappear.If the font size on an external CRT monitor seems too small for comfortable viewing, try clicking the Advanced button on the Settings page, and then adjust the DPI (dots per inch) value. Try 120DPI and 135DIP, to begin with. Avoid changing the DPI to much greater values, in order to avoid settings that will be difficult to change.

1. Hold down the power button for approximately 10 seconds until the computer turns off.
   
   
2. Verify that neither one of these keys are stuck in the down position:
   
   the Tab key (arrows pointing left and right)
   
   the tilde key ( ~ and ` characters)
   
   
3. Turn the computer on.
   
   
4. If either of the keys above appears to be stuck in the down position, and if the issue is not corrected by pressing these keys repeatedly, then service is required.

try to use another memory card if the problem with still appear if yes turn on the PSP with out any memory card or UMD then try to reset the settings

powe supply capacitors or screen drivers suspect check background screen voltage the cold flourecent light driver could be unstable check also all cables and plugs first.

Hi Kindly try the below menthod just boot to the last knon good configuartion. Then it should work fine .

Try another monitor.  If that doesn't work reinstall your video drivers with control panel system device manager.
James Mac

really? here's the thing..try to check the display settings manually.press the menu button of your monitor then try adjust the contrast, brightness and colors as well to your desired level..if your'e using LCD monitors, these are very sensitive and can be easily damaged if don't handle it very well..don't press the auto button always because it will automatically adjust the settings every now and then..

i have sony kv 14 gmr1mk r2ks always shorted and the other 1 appear like a lightning in midle of screen.. kv 21gmr1mk when adjust the brigth and contras it shut down the picture and blinking..can u help me how to troubleshoot this problem? what remedy you sudgest..thank you...