I'm having sever latency issues on Logic 9 through the built-in input (despite having no plugins active and 32 bit buffer size selected)

Question

I'm literally running a guitar straight into my computer (no plugins, no interface, just the "built-in input" on my macbook) and there's a LOT of latency. I'm very experienced with Logic and pro-audio (I have logic on my other computer and it works fine) but for some reason there's a ton of delay on my signal. NO idea where to start with this one. I've examined every option within Logic and nothing seems to be helping. I've changed every parameter, including buffer size, disabling and reenabling core audio, and low-latency mode, but nothing has worked.
Any advice would be appreciated, thanks.
Also, I'm using a late 2011 15" Macbook (Quad core, 4 GB ram)

Answer 1

Never heard of this before... what are you using for output in Logic's Audio Prefs?
Are you on 10.7.5 as you signature says?  There is a supplemental update for early builds of 10.7.5 that were released.
Take a look at the Audio portion the "Audio-MIDI Setup" in Utilities.
Bit-depth, sample frequency?  Try it at 16-bit 44.1kHz.  Is Logic set to the same?
What kind of cable are you using to get the guitar into Logic, the Mac audio input jack is multifunction, could you be partially enabling the digital I/O.
just tossing some ideas..