I'm not sure about the iPad, but I do know the dock connector (32 pin) on the older iPods at least do have an audio in line and are capable of recording in stereo. I don't know if they're still made, but there's a device called a "Mikey" which plugs into that connector on the bottom so you can record with it. I tried mine tonight on the iPad and it does NOT support that particular one. My Mikey is the very first one they made, without the USB port on the side of it, and designed for the very first iPod up to I believe iPod 2nd generation. The later design with USB port MIGHT work with the iPad. It was designed for later model iPods up to but not including those using a Lightning connector on the bottom. Mine records very good quality audio and I use it to record my own music gigs and playing and at open mic and full music sets I play sometimes.
Mayer, check EVERY ribbon cable in that thing. I bought one that was doing the same thing off Ebay for a hundred bucks and several of the ribbon cables were loose. When I checked them all and reseated them, it worked fine. It's now my second and testing computer ... I use it to test parts I might want to put on this one so if anything goes wrong, I don't mess up my main computer. Also could be a hairline crack on the logic board causing problems. You can't really see those very well but they might sever a connection on the printed circuit board also causing problems. I'd probably get on Ebay and buy a logic board off there to replace it. Lynn in New Orleans, LA.