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AC Charging / Battery problem for Samsung R40

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Having a frustrating and odd set of problems with my Samsung R40 laptop. First of all - for some time I've had an issue with the AC charger only charging intermittently (light indicator flicking on/off etc). At first I figured it was an issue with the charger itself but have now gone through two or three chargers. I've read up that the problem is likely to do with the AC power pin being loose and would require a professional repair.

To avoid this irritating problem, I tried booting with the battery removed. The AC charge light stayed on - but Windows refused to boot up. Does anyone know why I can't boot Windows with the battery removed? I'm really out of depth so any help would be much appreciated. Initially it seemed the power pin was the issue, but since the light stayed on with no battery I'm not so sure - doubly so since the laptop subsequently wouldn't boot.

Anyone have any ideas? Would it be worth my while getting a new battery to see if that helps? Also worth mentioning I haven't had any noticeable problems with battery before, it's charges well and the laptop still has a reasonably decent battery life.

Cheers for any help.
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Did you buy a genuine original equipment PSU/charger when you replaced it? They are more expensive than the so called 'compatible' copies but are also more reliable. The cheaper ones often don't contain the correct circuitry to function properly and are more probe to causing problems & early failure.
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