Solve : dell power supply cycles from detected to undetected ever 20 s

1.	Solve : dell power supply cycles from detected to undetected ever 20 seconds or so?
Answer» Dell Alienware 17 The adapter cycles from detected to undetected every 20 seconds or so and battery tends to stay not charged. I have replaced the adapter with NEW one and same thing. This started happening with no apparent reason whatsoever. I have taken apart the laptop to look at the jack and no apparent DAMAGE or LOOSE wire. This happens at a fixed interval and doesn't seem to be RANDOM at all.

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