Dell XPS M1730

Hello,

My dell XPS m1730 isn't booting and was wondering if I could get some help finding the exact component that needs replacing.

Firstly When turning the laptop on with the battery plugged in and no charger in nothing happens. When leaving the laptop charging for a few hours then trying this again still nothing happens. The battery doesn't appear to be charging. This isn't the major concern just something to take into account. Pressing the button on the side of the battery shows 1 dot flash green like it has slight power.

When turning the machine on with the power cable and battery plugged in it turns on; all lights come on: keyboard, track-pad, speakers, case lights, power indicator, battery charging indicator and Bluetooth indicator. The screen doesn't light up or appear to come on and there is no sound from fans at all and I can't see them spinning. 

I have turned it on holding the D+power and the screen lights up grey and passes the screen test by the look of it. 

Now, when turning it on holding the fn+power it starts by flashing the caps lock light for a few minutes. It then plays a little musical tone while flashing numlock to scroll lock one after each other. It then proceeds to play the beep codes. Yesterday the beep code appears to be 4-1-1. Today it seems to be 1-4-1. All three keys light up (caps, num and scroll lock). Looking at this I think it seems to be a motherboard problem. 

Video Link to FN+power test (sorry its dark but you can see the lights flash and hear the beeps which is all you really need.)

I've heard this type of laptop has a few problems with its GPU though so I proceeded to take out the GPU and try turning it on without it. It then has a constant scroll lock and the caps and num lock flash. 

I have also tried re-seating the memory. I tried 1 stick in each slot and then the other stick in each slot. This changed nothing. 

So my question is what is wrong with it? Is it the motherboard? Or is it more likely to be something else?

Pictures of information gathered from another thread:

 - CPU Error
- Keyboard Error
 - LCD Error
 - Memory Error
 - MiniPCI Error
 - Modem Error
 - System Motherboard Error
 - No Memory installed
 - USB Error
 - Video Card Error