After attempting to fix such a problem and continually receiving no joy, I consider it a lemon. I would have returned the computer and got a different model or make.
Hope this helps.
I have a Gateway MD2614u.
I have trouble with the AC adapter connection. When plugged in, the AC connectivity goes in and out with the slightest movement. Gateway has replaced the adapter several times, and I have purchased several replacement adapters. I have returned the laptop for depot repair on three different occasions. Gateway has replaced the motherboard twice and the battery once. The problem is still not resolved, yet their techs claim that they can't reproduce the problem.
I have no idea what to do. Please advise.