Dell Inspiron 15r 5521 gives 4 beeps and does not start

taqee

Estimable
Jul 1, 2015
1
0
4,510
Recently formatted the laptop, and now when I turn on it gives 4 beeps at regular intervals and doesnot turn on. I tried to remove battery press power button for 20 seconds and re insert and power on.
removed the ram and re inserted.
both of them were not successful
I even did a full hardware diagnosis once when laptop luckily opened every thing was fine. no issues with hardware were detected
Help me out of this..