My sound input jack is messed up - have to pull the mic sideways and tape it to the side of the case to keep it working. it's the jack - I've already tested other mics. Apple store tech guy says I'll likely need a new logic board (motherboard to us PC folk). I'm just wondering what the likelihood I'll get through that without any other problems. Also - I installed an aftermarket fan on my ATI x1900 due to the noise level - if I take it in with that fan on will I get into any trouble? I was planning on upgrading to the new Nvideo card, but we all know how well that is going. this is a year old mac pro, BTW.