Why is my pc destop not showing only black

@aadilkaymkhani you are not giving us much to work with here. It would be good to know if anything happened to your computer or what you have checked. It would also be good to know it the computer even comes on. Anyhow, if you think it does and if you think everything else is okay, just connect an external monitor. If that shows your desktop you know your computer needs a new display or display cable etc.

Use the Acer Travelmate 290 Service Manual to work on it. Page 65 tells you how to check the LCD. Let us know what you find out.

One day I start my PC the screen not showing the display I try every single thing to show display but all in vain in starting my PC got automatically restating problem and then give me. Black screen

If your PC shows only a black screen, it could be a display issue, a loose cable, or a problem with Windows not loading properly. Try restarting, checking cables, or booting into safe mode if you can.

First of all you make sure Screen is not damage if it is working then try to go into bios setting if it work or not then open the computer then Pull out the Ram and clean it and put it back if still same then open its CPU try to clean it only Air Blower be careful CPU is very sensitive then again try it will work.