You should first check if the battery has enough charge. you could also check if the LCD or the connecting cables are damaged. If the LCD is even slightly damaged the entire screen wont work.

The battery must be damaged or just simply juiced out. You might want to replace the battery for a new one. You also might want to take a look at your charger cable to make sure nothing is wrong with that.

You could try to change the battery since there is a high chance that it is juiced out. You also might want to do a check of the charging cable you are using, if it is working fine or not