Laptop not booting BSOD [Closed]

Registration date
Thursday August 4, 2016
Last seen
August 4, 2016
My laptop having a problem like when powering ON only power LED is ON, HDD led just blinks for 1-2 secs and goes off and there is nothing appears on the screen not even my caps lock key led working,but fan and USB ports are working, i did below troubleshooting steps

1) i pressed fn key and power button than luckily laptop started and was working fine then suddenly blue screen error appered and I tried to restart but now same behavior even fn key not works anymore.

2) I run screend diagnostics by press D and power key it is fine showing colors.

3) I disasembled the laptop and didnt found any obvious hardware issue

Need ur support...