My Son (who's 17), has figured out why some of the HP Laptops fail. On some of the earlier HP Laptops, the cooling for the internal graphics chips is inadequate, which causes one or two on the pins on the graphics chips to lift off the motherboard.
When you try to boot the Laptop, the Graphics chip doesn't output to the screen and hence the Laptop is thought to be trash, so they give him the Laptops for free.
What he does, is to dismantle the Laptop to get to the graphics chip. He then re-flows the Graphics chip by heating it up with a re-flow station (cost me about $90, that I use to build the DLA projects) with the heatgun attachment (set at about 450 degrees C). Once the solder on the motherboard melts (re-flows), he pushed down hard on the chip and lets it cool.
Here's the re-work station I use:
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LoginHe then gets an early penny (it has to be an early penny, since they had more copper in them apparently and stops the cooling problem), coats each side of the penny with some heatsink compound and applys this BETWEEN the Graphics chip and the Graphics chip heatsink. He then reassembles the Laptop and all is well again.
He's successfully repaired 4 HP Laptops that are still working after 1 year since the repair.