Hello! I have an eMachines M5312 (crappy laptop, I know). It still works fine, except that it emits a high-pitched hum when I have the battery in. If I remove it and just use the power cord it is fine, but it's annoying to not have any battery power. I can hear that the sound is coming from the area around the battery, but I don't know if it is a problem with my battery or something with the internal power. Any ideas?