Zinzee, check the AC adapter first. (Charger)
Wiggle the power cord from AC adapter to surge protector.
See if the AC adapter LED power on light, blinks.
Yes? Bad power cord.
The port on your laptop that the AC adapter plugs into, is the DC Power Jack.
Wiggle the cable from DC Power Jack to AC adapter.
Power On LED light up, or blink?
Change? New AC adapter. (Also need to check DC Power Jack center pin, to ensure problem is cable, not DC Power jack)
Unplug the AC adapter from the surge protector. You will need a multimeter now.
An economical multimeter can be purchased for as little as $5 to $12. Available at a multitude of stores. An auto parts store is but one example. (Not for $5 probably )
The Function Knob is set to DC Voltage. (DCV)
If just a symbol it is a dotted line over a solid line.
The center hole in the plug of the cable that goes to the DC Power Jack, is the Positive connection. This is where the RED probe lead (Positive), of the multimeter goes to.
The outside cylindrical metal shell of the plug is the Negative connection. This is what the BLACK probe lead (Negative), touches against.
You should read very close to 19 Volts (DC)
Have an assistant wiggle the AC adapter cable to DC Power Jack.
AC adapter is good? No intermittent reading on multimeter?
Remove the Battery. Take a No.2 pencil, and use the eraser to GENTLY, see if you can wiggle the center pin around, of the DC Power Jack in the laptop. (DC_IN)
ANY perceptible movement means a problem with the DC Power Jack.http://www.amazon.com/POWER-SOCKET-CONNECTOR-SAMSUNG-SERIES/dp/B008AGK43O
Chose link for the 4 views of the DC Power Jack.
Underneath the large Main view, there are 4 smaller views. Click on the one all the way to the right.
This is a view of the Back of the DC Power Jack, and the side that faces in on the laptop.
Note the L-shaped prongs on each side of the jack. These go down into the motherboard, and are soldered to the motherboard.
The 3 vertical lugs you see on the back, are the power, and Ground connections for the jack, and are also connected to the motherboard.
1) The center pin of the jack mounts to the jack's body, like a rivet. It is squished on the back, and this holds it in place.
Very easy to break that mount, and loosen the center pin.
2) The connections on the back are soldered, as previously stated, as are the 'L prongs' on the sides. Solder connections are also known as Solder Joints. If the jack moves with the pencil, and it seems to not just be the center pin, one or more of these solder joints could be cracked. (Broken)
Number 1 above means P-r-o-p-e-r-ly removing the DC Power Jack, and properly soldering a new one in.
Number 2 above just means re-soldering cracked solder joints.
DC Power Jack proves to be good?
At this point those who use the moniker 'Technician', but in reality aren't a tech, will want to replace the motherboard.
In reality the Power MOSFET's should be checked, to see if they are good.
IMHO a $4 to $5 P.MOSFET (Or two of them), is much cheaper than a $200 motherboard.
Of course if there is $125 to $150 in labor, the savings isn't that great.
Buy an ESD wrist strap, connect it's alligator clip to a good ground source, remove the motherboard, buy the DC Power Jack, and take both to the tech. Should be about $50 labor, or less to replace the Power MOSFET/s. (May not be both of them, just one)http://www.radioshack.com/product/index.jsp?productId=2103245
[ I connect to an unpainted surface, of the metal frame of an open, empty desktop computer case.
You can also set a large metal serving tray (Unpainted), on the table you are working on, or a large metal knickknack (Unpainted), and connect to it ]
No Zinzee I do not know what manufacturer, and manufacturer number, of P.MOSFET's are used on your Samsung.
I DO KNOW;
1) They us J-leads on the bottom.
They are located near the DC Power Jack on the motherboard, usually. Example using HP dv6000 and dv9000 series laptops,http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html
Using Fairchild FDS6679 Power MOSFET as an example,http://www.ic2ic.com/search.jsp?sSearchWord=FDS6679
For additional questions please post in a Comment.