This Gateway P series laptop came in with a loose power plug connection. You could wiggle the tip of the ac adapter cord in just the right way to get it to power on. The dc jack has come loose from the mainboard and needs replacement.
The P-7805u needs to be completely taken apart to the motherboard to access the dc input. On this model it's located on a seperate i/o board that plugs directly into the motherboard. This board can also be replaced if it's damaged. The jack is soldered to this board so the proper skills and tools are needed for a good replacement job.
Once the jack is replaced the laptop works great and the power connection is solid again.
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