In simplest terms, what's happening is that when I connect a power source, either the battery or the ac adapter to my hp pavilion dm4t, the light close to the plug turn on normally as it should, while the light at the power button turns on for 1 second and then goes off. I can't turn on my laptop and I tried different combinations like running with only a battery, another power adapter or only on ac power, but nothing seems to work. I'm also pretty positive that it's not a "motherboard gone bad" problem. It did this same thing a while back but back then it worked after a few minutes.
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