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Wolfe,
The laptop you are working on,
Does it by chance have an AMD CPU with an Nvidia GPU chipset?
The symptoms you describe sounds like a known issue with that combination. The heat gets so great that the solder joints open up on the GPU and causes intermittent glitches, Typically the wireless nic will work off and on then not at all...eventually the system board will completely fail and never post ( power on self test ) again.....
The Nvida chip controls the video and NIC. sometimes I can reflow them and fix them but even that is often temporary. A few months at best.
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