Alienware M11x R1 No Boot (Lights up when charger is in)

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So I bought an Alienware M11x a couple of years ago (got in a sale for a decent price). To me it was a second computer so it wasn't as if I overused it, used for about an hour of so a day. Then all of a sudden it started taking numerous attempts to turn on and then about a week later there seemed to be no life in the laptop anymore. Searched online for a number of weeks looking for a solution, attempted all solutions and still nothing. Contacted Alienware but since my warranty had just ran out they said they could replace, yes replace the motherboard for £750. So they basically wanted me to pay over 3x what I paid for the whole laptop just for the motherboard.

Basically I wanted to know if anyone else on the forum has had a similar problem and whether or not it is fixable or is it best for me to just buy a new motherboard (not from Dell/Alienware of-course).

One thing I found a little weird is that the laptop doesn't boot at all but if I plug the charger in the Alienware head lights up on the laptop.

Thanks for your help in advance.
 
Solution
A different motherboard is usually not an option for laptops - I'm going to suggest replacing the CMOS battery within the laptop since it going bad can cause issues. Disassembly guide can be found here https://www.youtube.com/watch?v=jeqQQU_PWRg the CMOS battery is first seen at 6:03 into the video (further disassembly would not be needed). It is the blue thing at the lower left of the shot there
A different motherboard is usually not an option for laptops - I'm going to suggest replacing the CMOS battery within the laptop since it going bad can cause issues. Disassembly guide can be found here https://www.youtube.com/watch?v=jeqQQU_PWRg the CMOS battery is first seen at 6:03 into the video (further disassembly would not be needed). It is the blue thing at the lower left of the shot there
 
Solution

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Thanks for the reply, I'm about to order one now to see if it is the battery. I'm hoping it is to be honest. Thanks again.