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Hey, glad to have found your site and appreciate your thoughts on this challenge. My kid spilled some coffee on my wife's MacBook A1342 (2010 version 2.4Ghz) a couple of years ago. It stopped working and has sat in a drawer for two years. We recently opened it up and found that the battery swelled so we replaced it this week. It appears to be charging (amber then green light), but the laptop won't turn on. There is no response to the power key. I disassembled the device to look for corrosion and cleaned up a few spots with 90.1% alcohol. The HDD appears to be good because we were able to access the data from another Mac using an adapter cable. I don't have a methodical test plan to identify my root issue(s). Ideally, it would be great to buy a replacement laptop, minus the HDD, and drop our working HDD into it. I just don't know a better option since I'm not a proper technician and don't have a test plan. Thanks for your help and wisdom.