I replaced my motherboard last night with a new motherboard. everything seems to be connected properly. however, upon pressing the power button, the computer attempts to boot and the fan is very loud. after about 8 seconds, the computer shuts off. No display shows up on the screen before shutting off.
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The video card in a laptop is a built in device, it isn't replaceable as in the case with PC workstations. Well, anything is replaceable. You would need to replace the motherboard would be my best guess, but that may not be cost effective, depending on the age of your system.
HP bought several motherboards from the same company in China. These boards work for about 15 months then they can't find the wireless card. This is caused by a defect in the North Bridge chip overheating over time. This chip is not replaceable at the local level. You can send it back to HP for a replacement and sometimes they will charge you $300 - $500, or you can just replace the motherboard yourself. Check with them first since there is an ungoing lawsuit regarding these boards. Either way the only fix is to replace the motherboard. This is also a problem for the dv6000 and the dv9000 models. HP knows that 30% of these will fail.
Have you tried putting the old memory sticks back in, if they still work, i would try just putting one of the 512's in. If that don't work try the other.
I'm guessing either one or both of the 512's are either faulty or not compatible.
Hope this helps.