
This gateway M-6337/SA1 (M-Series) came in and simply wouldn't power on (powers on off battery). When plugged in the jack didn't seem overly loose but it won't power on unless the ac adapter plug is held in a certain angle.
The M series use the same six pin, 2.5mm dc jack gateway has been using for years until they were bought by Acer. These laptops seem to fall victim to the cold solder joint but can be fixed.
The laptop needs to be completely taken apart to access the dc jack and it is soldered onto the motherboard. The old bad plug needs to be de-soldered and a new dc jack soldered back on.
Once the power connection is replaced the laptop charges the battery and powers off AC.