display problem have white dot and black dots please any suggest for problem

Start with an LCD screen diagnostic - hold D through powerup.

If the fault shows on the test screens, the display panel needs to be replaced.

If it does not, the problem is elsewhere - could be a faulty driver, video cable or GPU (mainboard).

The dots visible on projected image may be due to various reasons:

- Corrupt menu settings of projector
- Issue with projector bulb
- Configuration and settings of Input source (Computer, etc.)
- Dust accumulation on lens panel

1. Check the performance of projector screen on start up. Does the Dell logo at start up look fine?

- If the dell logo appears corrupted, we will reset the factory default settings on the Dell Projector to see if that works
- If that step fails, we need to check and reseat the bulb
- If the Dell logo appears fine, try a known-good computer or video source to the projector, if available
- If the problem gets fixed with a known good PC, the functionality of your input video source (PC, etc) needs to be checked

2. I would appreciate your answers to the following queries. With this information handy, I will be able to provide you with precise troubleshooting steps.

- Name and model of you Dell projector
- What is the color of dots visible on the screen
- Has the projector bulb been replaced before?
- What input video source are you using? Is it a computer?
- Which operating system is installed in the computer?
- If yes, which video card is installed in the system?

If you are unsure about the type of video card installed, you may find these steps useful (Only for Windows operating system):

 - Click ‘Start Icon’, and then click ‘Control Panel’
 - Click ‘Hardware and Sound’
 - Click ‘Device Manager’
 - ‘User Account Control’ dialog box may appear
 - Click Continue
 - ‘Device Manager’ Page opens up
 - Expand option ‘Display Adapter’
 - Capture the names of listed devices

Welcome to the Dell Community @KumaranS15 

To better assist you, the members and I would need the exact model number of your laptop/desktop???

1. Identify your Dell:

https://www.dell.com/support/contents/us/en/04/category/product-support/self-support-knowledgebase/l...

1. Go into your BIOS.

Power-on the system and start tapping the F2 key to enter System Setup.

1. In Windows:

Hold down the” Windows “key and tap the “R “key.

Then type msinfo32 and hit enter.

Best regards,

U2