hp g62 motherboard and not powering up unless battery removed?

Hi this will sound odd and confusing , my hp g62 laptop stopped working so I shoved it in the oven for 5 Min’s , brought it back but still no picture on screen . I put it on external display and works fine , but here is the odd bit to start it I have to remove battery and power adapter for 5 Min’s and when I insert the cable it starts by itself , power button doesn’t work , I have tried 2 different ones with same result , when I shut it down I cant restart for 5 Min’s and the charger light on side of laptop just flashes orange or stays orange some times the caps will flash . But once I get it working its fine and fast , I have reseated the ram cant do the power button test as that’s the main fault which confuses me the most so please people why is my laptop turning on from my dc jack , I can and will learn to solder the motherboard if fault is found

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