Just a hunch.. My iBook's screen looks old, kinda unevenly lit. Barley noticable though, and the whole lid assembly was slightly "off" being crooked. Again, very slight.
Those could be just manufacturing issues, i know nothing is perfect, but there is one thing that made me think its a refurb. The plastic inside the ethernet port is a slightly different color then the plastic in the modem port. The modem port has the standard grey plastic inside that matches the rest of the grey plastic found on my iBook, but the plastic in the ethernet port is kinda beige.. A color found nowhere else on this laptop.. Seems like a replacement