Black screen and fan spin for 5 seconds

I have this v5-561P laptop for 3 months and all by sudden i tried to power it on but nothing is happening i have black screen and i can see the power led on for 5 seconds only and then all off same for cpu fan, spin for few seconds and then off.

i tried to do multiple troubleshooting

- Disconnected the battery and put it back again.

- Also Disconnected both battery and the charger and hold the power bottom for 30sec.

- Then i toke the laptop apart and start to test with only the motherboard and the monitor only but still the same.

is there and more i can do before throwing the laptop on the trash ?