Jean,This is a long read, better put the coffee pot on. I explain in detail.The HP Pavilion dv2000 series, Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's; has an inherent problem.The cooling for the graphics chipset is inadequate.Small primer if I may;Chip and Chipset are slang terms for I.C.Integrated Circuit,
http://en.wikipedia.org/wiki/Integrated_CircuitThe I.C, or chipset; used for graphics is a graphics chipset; or properly known as a G.P.U.Graphics Processing Unit.(Hope you're not a teacher, or Professor, because I am probably slaughtering Punctuation! lol!)The basic model of Pavilion dv9000, uses an Nvidia GeForce 7600 Go, graphics chipset,
http://h10025.www1.hp.com/ewfrf/wc/product?product=3224049&lc=en&cc=us&dlc=en&lang=en&cc=us The Pavilion dv9000z CTO is a Custom To Order, do not know what graphics chipset is used exactly.(P/N = Product Number, in the white Service Tag, on the bottom of your laptop. Post in a Comment as to what it is)Whatever graphics chipset it is, it will still use a BGA surface mount.Primer over.This is an example of an Nvidia GeForce 7600Go graphics chipset,
http://www.ebay.com/itm/1p-nVIDIA-GeForce-GF-Go7600-N-A2-G73M-GPU-BGA-Chipset-/330632940713?pt=LH_DefaultDomain_0&hash=item4cfb424ca9(Size is approximately 1 Inch x 1 Inch, or 25.4mm x 25.4mm)You are looking at a Top View. The thermal cooling module, sits on the black chipset in the middle.The bottom side not shown, has Solder Balls.The mounting of the graphics chipset TO motherboard, is a BGA surface mount. Ball Grid Array,
http://en.wikipedia.org/wiki/Ball_grid_arrayCompare to an older Intel Pentium 4 processor, that uses a Socket 478 processor socket,
http://en.wikipedia.org/wiki/Socket_478The bottom of the Processor has 478 contact pins.The Socket 478 processor socket has 478 matching socket holes.With a BGA surface mount there are no contact pins, nor socket holes.The bottom of the graphics chipset has Solder Balls.The motherboard has matching Copper Pads.(Copper Pads are also gold plated)The graphics chipset is set down onto the motherboard, with it's Solder Balls lining up to the matching Copper Pads, on the motherboard.Heat is then applied at a specific temperature, and length of time.This action melts the Solder Balls, and forms solder connections; or also can be said as solder joints.Solders the graphics chipset TO the gold plated Copper Pads.Can also be said as solders the graphics chipset, TO the motherboard.With inadequate cooling, and repeated overheating because of the graphics chipset; the solder joints will partially melt.When the laptop is turned off, the solder joints (Connections), will cool, and re-solidify.This causes Cold Solder Joints, and a bad contact of graphics chipset; TO motherboard.HP is/was aware of this. There was a class action lawsuit. It is over.Then HP blamed Nvidia, and it wasn't their fault. Needless to say that arbitration didn't go over either.The fault is computer design of the cooling system, for the graphics chipset.Let's look at the cooling system;1) If the laptop uses an Intel processor,
http://www.getpartsonline.com/434678-001.html(HP 434678-001)2) If the laptop uses an AMD processor,
http://www.notebookparts.com/products/image.php?SECID=&image=http://www.notebookparts.com/images/fullsize/438606-00_fs.jpg&name=438606-001+HP+Pavilion+dv9000+Cooling+Fan+and+Heatsink(No. Not much difference. HP 438606-001 )Click on the photo of the Thermal Cooling Module.See the black rectangular object in the front? That is the finned Heatsink.The D shaped aluminum housing, and the black fan in the middle, (You can see a few blades), is the Fan AssemblyThe copper looking strip, is the Cooling Tube.At the end of the Cooling Tube is a rectangular shape that is light gray(?)Coming closer to the Fan Assembly there is another one, and it is light blue.That actually is a Thermal Pad.It is also the area of the Cooling Tube, that sits on the graphics chipset.The copper area of surrounding metal, is TOO small in surface area.(The other small plate area sits on the Processor)Primer:A) Cooling Tube: Slightly flattened copper tube sealed on both ends, and filled with Nitrogen.Heat is absorbed by the small plate area on the Cooling Tube, that sits on the Processor, and the small plate area that sits on the graphics chipset.The heat is then absorbed by the Cooling Tube. The Cooling Tube transfers the heat To the finned Heatsink.B) Heatsink: Small strip of metal that has a lot of thin, tall, fins on it.Usually made of Copper or Aluminum.Heat is absorbed by the Heatsink, and radiated away with it's tall, thin fins.C) Fan Assembly:D-shaped housing, with a small fan inside.Air flow from the Fan Assembly helps carry heat away from the fins, of the Heatsink.Primer over.That small copper area of the Cooling Tube, that sits on the graphics chipset; needs to be increased in surface area.The solder joints, or connections; need to be reflowed.Best method is to have a BGA Rework Station do the job.Video showing a BGA Rework Station in use, and more information of the Solder Balls/Copper Pads; of the BGA surface mount,
http://www.ersa.com/art-ir-pl-650-346-1472.htmlScroll down, click on the Red -Take a few minutes to view the IR 650 demo videoTHIS, is one tech's solution to fixing the problem,
http://www.youtube.com/watch?v=bnkQNmKauEcIF you are in Europe there are a lot of professional shops that have a BGA Rework Station; to my knowledge.Here in the USA there are a FEW.BGA Rework Station, and adding extra surface area for the graphics chipset, is the Solution.Summation:Having the graphics chipset reflowed to the motherboard, WILL NOT SOLVE THE PROBLEM.The surface area on the Cooling Tube; for the graphics chipset, HAS to be increased. OR, you will be right back to where you are now, in the future.HP Support > Pavilion dv9000z > Service Manual,
http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=3224049&Scroll down, click on the blue -HP Pavilion dv9000 Notebook PC - Maintenance and Service Guide(3.72M)This 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.I realize the above is a lot to absorb. I hope you can make your way through my prattle.For additional questions, or to have me clarify anything stated above; please post in a Comment.Regards,joecoolvette