Shane, new power cord? Does this mean the old one was bad? Do I assume you used a multimeter;1) To test the voltage output of the AC adapter (Charger), 2) And had an assistant gently wiggle the cable TO laptop, and power cord TO AC adapter; to see if there was an intermittent reading on the multimeter? [The Center Hole on the plug end of the AC adapter cable TO laptop, is the Positive connection. The outer cylindrical metal shell of the plug, is the Negative connection.You should be reading 18.5 Volts DC.An economical multimeter can be purchased for as little as $5 to $12. Available in a multitude of stores. An auto parts store is but one example. I have seen them on the checkout aisle racks, of large discount stores.The Positive (Red) probe lead is inserted into the multimeter, in the Red hole that has DC Voltage next to it. (DCV)The Negative (Black) probe lead is inserted into the Black hole ( - )The Function knob is set to DC Voltage. If just a symbol, the symbol is a dotted line over a solid line.IF there is more than one DC Voltage scale, the Function knob is set to the 0 - 50 Volt scale. { 0 to 50 ]AC adapter checks OK?Then check the DC Power Jack.The DC Power Jack is the jack on the laptop, that the cable from the AC adapter is plugged into. (DC_IN)AC adapter removed, ('Natch), and Battery.Use a No.2 pencil, and it's eraser, to see if you can gently move the Center Pin, in the DC Power Jack.ANY perceptible movement means replacing the DC Power Jack.However good news. The DC Power Jack is NOT soldered directly to the motherboard.It is a DC Power Jack that has wires coming from it, and the wires end in a small white plug.This assembly is called a DC Power Harness,All you have to do is partially disassemble the laptop, unplug the DC Power Harness plug from the motherboard, and replace,
http://www.amazon.com/Harness-COMPAQ-Presario-Pavilion-Series/dp/B004SFQA7UUSE AN ESD wrist strap, and connect it's alligator clip to a good ground source.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 plate (Unpainted), on the table you are working on, and connect to it.Or a large metal knicknack. (Unpainted)Use a mutli-compartment container for the various screws you will remove.Label each compartment for the area the screw/s come out of.SOME screws look VERY similar to other screws.Advise do NOT mix them up.
http://www.insidemylaptop.com/hp-g62-compaq-presario-cq62-disassembly/(Just so you have it in case you need it for the future,
http://www.insidemylaptop.com/replace-lcd-screen-hp-g62-compaq-presario-cq62-laptop/ )HP Support > Compaq Presario CQ62 series of Notebook PC's > Manuals > Service Manual, (Free),
http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=4188484&Click on the first file listed -Compaq Presario CQ62 Notebook PC and HP G62 Notebook PC -Maintenance and Service GuideThis is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.After you click on the above file name it may take up to 30 seconds, before the first page comes up.(The file is downloading in the background)AC adapter checks out, DC Power Jack checks out?Check the Power On switch.The Power On switch is pressed with the Power On Button.The Power On switch is part of the Power Board,
http://www.ebay.com/itm/HP-G62-Compaq-CQ62-G56-Power-Button-Board-4EAX1PB0000-DA0AX1PB6E0-595204-001-/120845794823?pt=LH_DefaultDomain_0&hash=item1c22f87e07This part separates the user from the tech. There are 6 wires in that flat cable. (I believe 6) There are 6 contact pins in the motherboard connector, for those 6 wires. TWO of those contact pins turn the laptop on. A tiny flat tipped Jewelers screwdriver, is used to MOMENTARILY touch the two contact pins.{The Power On switch is a Momentary Contact Switch }Laptop comes on you have a bad Power Board.Laptop does not come on;One or more Power MOSFETs may be bad, and may include bad Ceramic Capacitors (MLCC) for the Power MOSFETs.Information using HP Pavilion dv6000 series, and Pavilion dv9000 series Notebook PC's as an example,
http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.htmlYes, motherboard replacementFor additional questions, or to have me clarify anything I have stated, please post in a Comment.Regards,joecoolvette
