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Hello. The M15x was released in 2009 and the M14x was from 2011. Did you have the M14x R1?

The first thing to do would be to try another power adapter. For your laptop you would need a 150W or 180W adapter but anything with the same plug will be good for testing.

You can also try removing the battery and then see what happens when you try powering from the adapter.

Another simple thing to try is a power drain. Remove the adapter and battery and hold the power button down for 30-60 seconds to drain all the residual power from the board. Insert the adapter again and test. Then plug the battery back in.

It may crash too soon but you can also try running the pre-boot diagnostic. Press f12 while booting to get into the boot menu. You can select the Diagnostic from here and it will run tests on all your hardware. 

Hi @Brandonbov  thank you for sharing. Seems the power socket in the laptop is at fault and shorting out when the charger's plug is inserted. This is reinforced when you say that the system tries to boot, but fails to complete POST. Take the rear panel off, disconnect the battery, unplug charger from ac mains. Then have a look at how the charger plug and laptop socket are responding to one another as the plug is inserted and withdrawn. This should confirm which one, or both is the problem and should be replaced. If you see damage or smell burning, this should confirm the source of the fault. 

Taking the rear panel off does not invalidate your Dell warranty. 

Hey sorry for the late reply, at the time i ended up getting a new laptop but still have this M15x sitting here collecting dust... Iv looked at the port and it does seem to be that as its solid... I can charge the laptop for 2-3 hours till full then use the laptop unplugged, then when i plug the charger in 5-10 seconds later in decides to crash... Im still stumped

Cool cool I’ll have to take a look, Battery and charging cable are new since I thought they were the issue, but still have the same issue

Hey there I’m gonna give this a try, pushed the wrong but hasn’t solved my issue yet

So, the good thing is that machine works fine. Yes.
Too much power?
Sounds like either the power adapter, or the on-board power regulator.
Odd, I have also heard of Alienware's acting erratically when the battery is at/near end-of-life.

Wait so the power drain did not work? Then who accepted my solution because I didnt do it?

This system is 10 years old? You may want to talk to Dell Tech Support directly. One of the moderator's replied to you below. Try replying to him directly through your Dell email account (top-right of this screen).