This Acer Aspire 5742 laptop came in with no life whatsoever. When plugged in the jack area felt pretty solid but no amount of wiggling or positioning of the ac adapter would get it to power up. Sometimes they are wiggled so much the jack simply stops working. If you keep wiggling and positioning the power cord you do run the risk of damaging the motherboard.
In this notebook the dc jack is on a cable that plugs in the motherboard. Its the same laptop/power plug as some the gateway NV53A.
The laptop needs to be completely taken apart to access and replace the dc jack. Once inside I saw the voltage wire on the cable had come free from the jack. This is why the laptop was getting no power at all.
The dc jack was replaced and the laptop powers on again!
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