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i have a presario 900us which for the last month or so has given me nothing but problems. the current one at hand is the adapter. i was having to twist the cord under the brick so it could power/charge the lap, but now it no longer works and now i get this beeping sound coming from the brick. honestly, it sound like a time bomb, beep, beep, beep... i guess i should assume that the adapter is done, but why the beeping noise?