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回答“Controller battery won't charge”I found that you have to push the charging cable in VERY far. Much farther than you think. Mine wouldn't charge either - then I realized it was NOT in far enough. If you're 100% sure it's all the way in and isn't charging then I can't help you with this 'simple' fix. Good Luck.
回答“Why does the electronic beeper beep and the sewing machine won't sew?”The Singer Athena will do this when the bobbin is threaded backwards... Sometimes it will sew for a few stitches - bunch the threads and then stop. Once that happens it will simply beep and not operate. Troubleshooting on bunching (a separate subject) can be done by loading distinctly different colored threads top and bobbin (bottom) and see which color thread is bunching. I know this sounds almost as stupid an answer as "is your machine plugged in and turned on", but truly it's easier to mislead the bobbin than one thinks. Hope this was helpful.
回答“backlight goes out after a couple of seconds”I bought an inverter and replaced it. The problem was NOT fixed. I then reset the SMC and the problem was fixed. Boy to I feel stupid now! On the MacBook with removable battery, 1. Unplug and remove battery. 2. Hold Power button for >5 seconds. 3. Insert Battery, plug in and boot. See Apple Support pages for resetting SMC on non-removable battery machines.