Hello, I just got one of these, and when I turn it on, there is no boot chime. I haven't had the chance to install an os, but I popped in a snow leopard drive from another macbook to test it out. Once it's booted, the audio is very quiet and tinny. Output through the headphone jack sounds fine. I have already tried doing an SMC and PRAM reset, and nothing changed. It currently doesn't have a battery, in case that might change anything. Thanks!