Dell Inspiron laptop not switching on

Most dells have this. While trying to boot up, tap F12. You should be brought to a menu. Using your keyboard select diagnostics. let it run, and most likely it will find a harddrive error. If you don't have any external encloser you can put the harddrve in, then you will want to download a Linux boot cd and try to copy the files you need to a flashdrive or if they are small email them.