HI all- this is helping, but have a similar problem. Replaced battery in January. Worked fine for a few months, and suddenly- it just stopped last week. The only way the computer works is if its plugged in- the MagSafe stays orange, regardless of how long its connected. The second I remove MagSafe, the computer shuts off. Battery icon in menu bar disappeared too, along with battery in system preferences. See pic for what it shows in the system. Do I just need a new battery? or could something else possibly be wrong?
Thanks for any help I can get-
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