2 weeks ago I ripped my AC adapter cord and they wouldn't replace it, so I bought a new one; on Monday I called Apple and they agreed to replace the one I ripped. I'm still debating whether to keep both or return the one I bought recently. Now the issue I have is the replaced that I bought and the replacement that they sent me both buzz very loud; I can hear it over the HDD spinning, so it must be loud. I just want to know if they would replace it again or is this another of those discrepancy things. If they won't replace it, I guess I'll get a refund on it, but I just want to get ready... Thanks.