alienware power jack issue ???

Test voltage of AC-Adapter. Specs should be on label.

If that passes, put some other appropriate load on AC-Adapter. If it stays on, it's likely the motherboard or battery.

Only other thing I can think of is to try a different but appropriate, known good, Dell AC-Adapter on laptop.

can it be also only a power jack issue ?

or maybe i can disconnect the battery and test with ac adapter 

Thanks 

voltage is good on the ac 

i remove the battery same issue 

it shutdown the ac adapter