how to fix dell problem screen and beep

hello everybody .. good morning i am gon from indonesia ^^

That might/might not be a display problem. The best way to check is to hold down the "D" key on the keyboard while turning on the laptop. That launches just the display diagnostic. If you see colors flashing, it means there is nothing wrong with your display. For a more detailed diagnostic, hold down the "fn" key on your laptop while powering it on. That launches the full Dell Diagnostic.

You can try opening up the front-panel and re-seating the display adapter if the Display test fails.

The number of beeps and the state of CAPS/SCROLL/NUM can be used to diagnose your issue. The Dell website has detailed sections documenting what the number of beeps actually means.

Commonly, these laptops end up with memory problems so you might want to try just removing one RAM module and powering it on, and also try the same with the other RAM module.