Hi Nikhil, Any external devices (except AC Adapter) connected to the computer. If yes, disconnected them and then try to power on the computer.  If it is same situation, then power off the computer. Press key down and then while holding the FN key power on the computer.   In case, the computer is stuck at Dell logo. It is an hardware issue, contact Dell Tech Support in your region to replace the parts. Hope this helps..
Hello,    I have a brand new inspiron 5447,  which was working fine till yesterday. If I try to boot now, it is just stuck at Dell logo and I am unable to go into BIOS settings. I tried pressing F2 and F12, but the screen is still stuck at same Dell logo screen. Can someone help me with this.   Thank you,  Nikhil 
Won't boot - Stuck at Dell logo screen 