My macbook screen not visible

Since you did not provide the exact model of your Mac it is hard to assist you. You can get the exact model of your Mac by entering your system serial number here:

Check Your Service and Support Coverage - Apple Support

If you have an Intel Mac, then you can try an SMC Reset.

You can also try connecting an external display to see if the issue is only with the laptop's built-in display, however, sometimes it is hard to get the Apple laptop to display on the external display when the built-in Display has problems especially until you can log into the laptop. You can try logging into the laptop blindly by giving the laptop enough time to boot, then typing the first character of a login name followed by pressing the "Return" key to select the user. Then type the password for that account followed by pressing the "Return" key again to submit the password. If successful you may be able to see video on the external display. Otherwise you may need to force Clamshell Mode by connecting the charger, external display, and a USB keyboard & mouse. Power on the laptop and immediately close the lid hoping you have the timing just right so video is put out to the external display instead of the built-in display.

Press the Caps Lock key to see if the Caps Lock LED lights up which indicates the laptop is powered on. If the laptop is powered on, then you can perform an SMC Reset (Intel Only) which will immediately power off the laptop, or you can hold the power button until the Caps Lock LED goes dark (Intel & M1). Power on the Mac so you can use Clamshell Mode or to make sure the laptop is at the login screen so you can attempt to blindly log in. Unfortunately sometimes macOS will become too helpful and present a password reset screen which will end up preventing a blind login and even prevent Clamshell Mode many times.

If you have no video on the built-in Display and the fan is running at high speed, then you likely have some sort of hardware issue. Try an SMC Reset (Intel only) or force a power off by holding the power button (Intel and M1) in case the laptop is frozen.

Also try disconnecting all external devices in case one of them is causing a problem.

Here is an Apple article regarding various startup issues you may encounter:

If your Mac doesn't start up all the way - Apple Support

If this does not help, then you will likely need to have Apple or an Apple Authorized Service Provider examine the laptop.