M6300 doesn't boot, Numlock LED on?

Hi, I'll like to check, my dell m6300 recently ran into problems with booting up. Upon the pressing of the power button, the screen flashes, but nothing shows, then the Numlock led lights up, and there it stays until I power it down.

Does anyone know what that means, like memory is not working, etc? Thanks in advance!

 

First things I would do in this order;

1) Remove battery and AC adapter and hold down power button for 30 seconds.

2) See if it displays anything externally.

3) Reseat RAM/HDD and retry step 2

4) Replace with known good RAM and retry step 2

If it replicates the same thing on the external monitor you got a defective motherboard/GPU possibly. If it only displays on the internal but the external is fine you got an inverter/LCD issue.

 

Does the numlock LED usually light up when the system has booted? If not, a numlock LED error message usually indicates modem failure.

Try connecting the laptop to an external screen, power the laptop on, then close the LCD.