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DC jack, where you plug the power adapter cable, might be loose or
defective, & needs to be either re-soldered or replaced. In order to do this, the laptop needs to be disassembled
& the motherboard taken out. Also, the motherboard needs to be checked for defective/burned out components in the
area near the DC jack. Any defective/burned out components found should
be replaced, or you might need to replace the laptop's motherboard
Most cases there is no need to replace the motherboard. Try to find out what component has burned and replace it. If the main power supply to the inverter board had shorted, then, the supply giving FET may be burned. You may see as it burned. If the inverter activating device ( a small FET) had burned, you can also see it. In some systems there is a fuse for the inverter supply in inverter board as well as on the motherboard. You can also identify it.Make a reply if this is helpful.
ok hmmmm maybe it only except 4x agp? is it very old? maybe the slot maybe burned out? do you have enough power source to run the card? i cant think of anything else.. good luck. my agp card did the same thing when the power source burned out. some day i would get nice veiw someday a dark screen. i though restarting would help and eventually the power source burned out.
maybe you should add a digital image of the actual burn mark you witnessed? "If it isn't broke, don't fix it" sometimes you think you have to fix something and end up causing more problems. It's probably just something simple from a soldering iron, but if everything works... i wouldn't touch it unless you really want to add a good image of it, I could tell you what it is.
When you reinstalled the processor, did you put thermal compound on it? Not putting thermal compound on an AMD processor could burn it. I've tried this before, thinking it was okay since i tried an Intel not placing any thermal compound, and there was burning smell on the AMD processor. If the problem before was the power supply, you might also want to check the motherboard. Defective power supplies destroy the motherboard as well. You may also want to check the if the power button was placed back to its pins. You may have missed that or the wire might have come loose.