Your Dell Inspiron 15 may have been working on a damaged battery or this part may be having certain problems in it. You can remove it from the back of the device. Then you can check the display. Later, you can place the battery again and try to turn on the machine. Hopefully, it should start working now.
More help can be found on this link: https://www.errorsdoc.com/dell/dell-laptop-wont-turn-on/