Give it to a computer shop and tell them to remove the gup chip set and use leaded solider. This issue occurs because HP used non leaded so it has a low melting point than leaded. I did the same thing and mines working fine its almost a year now. I also cut a hole in the bottom cover and added a extra PS3 fan to all the device to breath more heavily.. No problem with it now works like a charm no over heating issues .
Reball wit leaded solder!