Laptop not booting BSOD

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Wasimoo9 Posts 1 Registration date Thursday August 4, 2016 Status Member Last seen August 4, 2016 - Aug 4, 2016 at 06:01 PM
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...