So my Acoustic/Electric (A Takamine EG something or other) won't work when I plug it into the Line-In on my computer. It works in the mic jack (The little light on the pre-amp turns on, and sound goes through), but that gets all sorts of bad static, which really doesn't work for recording. Sound does go through the Line-In if I activate the battery, but it turns off automatically after a little while, and I don't know how to change that either. The Pre-amp is a TK-40 I think.

Any ideas why this might be, and how to fix it?