Hey all, I have a 3 year old 24" iMac (see sig). I recently discovered the optical drive is not working any more. It won't accept any discs and just spits them out. Two questions: -I assume the drive can be replaced somewhere like the Apple Store. Does anyone know about how much that would cost? -Are there any alternatives to replacing the internal drive, like buying an external desktop optical drive? If so, what's a good one to get? Thanks for any info.