No Audio Drivers recognised

My GB2 is not working.
Don't quite know when it started as I have been updating lots due to Apples updates recently, but when I try to boot GB2 it will not startup.
I have managed to get my preferences window open to find that no audio drivers are being recognised. Does anybody know why ? It used to work flawlessly.
I think core audio is the problem ?
Help !
Any suggestion would be appreciated.....

I haven't seen a responce as of yet.
I did some of my own investigating though.
I did hear a pop when I plugged into the Macbook. As a musician I knew that the "pop" wasn't good but I had no idea it would be this fatal!
The things to look for are these:
Make sure that there is no "red light" on in the line in port. That would indicate that the source is wrong. Search the forums for that easy fix.
If your still able to hear anything out of the internal speakers (start up chime, system sounds ect) then check the utilities folder and check the Audio midi device.
If (like me) you have nothing. No system sounds, nada, then go under *Apple>About this Mac>More Info* and see if there is anything listed under "Audio (built in)". If there is nothing listed their then it's time to head to your local Apple store for a repair.
I have not taken mine their and won't be able to until after the holidays, but I did find a recording work around until then by using a little device by Griffin Technologies called the iMic. It does the job and it's under $50.
Here's the link to the iMic:
http://www.griffintechnology.com/products/imic
I should note that this is a version 1 Blackbook. I do have the screen flicker problem that the first gens had, as well as the complaint that the internal speakers, even at the highest settings, were not enough for any listening other than in a completely silent room. There also was some clicking on the hinge when you open it. Once I get it to the Apple store then I'll get it fixed proper but until then this workaround is a cheap solution for now. After all, the band MUST play on.
Fenix

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  • A quick primer on audio drivers, devices, and latency

    This information has come from Durin, Adobe staffer:
    Hi everyone,
    A  common question that comes up in these forums over and over has to do  with recording latency, audio drivers, and device formats.  I'm going to  provide a brief overview of the different types of devices, how they  interface with the computer and Audition, and steps to maximize  performance and minimize the latency inherent in computer audio.
    First, a few definitions:
    Monitoring: listening to existing audio while simultaneously recording new audio.
    Sample: The value of each individual bit of audio digitized by the audio  device.  Typically, the audio device measures the incoming signal 44,100  or 48,000 times every second.
    Buffer Size: The  "bucket" where samples are placed before being passed to the  destination.  An audio application will collect a buffers-worth of  samples before feeding it to the audio device for playback.  An audio  device will collect a buffers-worth of samples before feeding it to the  audio device when recording.  Buffers are typically measured in Samples  (command values being 64, 128, 512, 1024, 2048...) or milliseconds which  is simply a calculation based on the device sample rate and buffer  size.
    Latency: The time span that occurs between  providing an input signal into an audio device (through a microphone,  keyboard, guitar input, etc) and when each buffers-worth of that signal  is provided to the audio application.  It also refers to the other  direction, where the output audio signal is sent from the audio  application to the audio device for playback.  When recording while  monitoring, the overall perceived latency can often be double the device  buffer size.
    ASIO, MME, CoreAudio: These are audio driver models, which simply specify the manner in which an audio application and audio device communicate.  Apple Mac systems use CoreAudio almost exclusively which provides for low buffer sizes and the ability  to mix and match different devices (called an Aggregate Device.)  MME  and ASIO are mostly Windows-exclusive driver models, and provide  different methods of communicating between application and device.  MME drivers allow the operating system itself to act as a go-between and  are generally slower as they rely upon higher buffer sizes and have to  pass through multiple processes on the computer before being sent to the  audio device.  ASIO drivers provide an audio  application direct communication with the hardware, bypassing the  operating system.  This allows for much lower latency while being  limited in an applications ability to access multiple devices  simultaneously, or share a device channel with another application.
    Dropouts: Missing  audio data as a result of being unable to process an audio stream fast  enough to keep up with the buffer size.  Generally, dropouts occur when  an audio application cannot process effects and mix tracks together  quickly enough to fill the device buffer, or when the audio device is  trying to send audio data to the application more quickly than it can  handle it.  (Remember when Lucy and Ethel were working at the chocolate  factory and the machine sped up to the point where they were dropping  chocolates all over the place?  Pretend the chocolates were samples,  Lucy and Ethel were the audio application, and the chocolate machine is  the audio device/driver, and you'll have a pretty good visualization of  how this works.)
    Typically, latency is not a problem if  you're simply playing back existing audio (you might experience a very  slight delay between pressing PLAY and when audio is heard through your  speakers) or recording to disk without monitoring existing audio tracks  since precise timing is not crucial in these conditions.  However, when  trying to play along with a drum track, or sing a harmony to an existing  track, or overdub narration to a video, latency becomes a factor since  our ears are far more sensitive to timing issues than our other senses.   If a bass guitar track is not precisely aligned with the drums, it  quickly sounds sloppy.  Therefore, we need to attempt to reduce latency  as much as possible for these situations.  If we simply set our Buffer  Size parameter as low as it will go, we're likely to experience dropouts  - especially if we have some tracks configured with audio effects which  require additional processing and contribute their own latency to the  chain.  Dropouts are annoying but not destructive during playback, but  if dropouts occur on the recording stream, it means you're losing data  and your recording will never sound right - the data is simply lost.   Obviously, this is not good.
    Latency under 40ms is  generally considered within the range of reasonable for recording.  Some  folks can hear even this and it affects their ability to play, but most  people find this unnoticeable or tolerable.  We can calculate our  approximate desired buffer size with this formula:
    (Sample per second / 1000) * Desired Latency
    So,  if we are recording at 44,100 Hz and we are aiming for 20ms latency:   44100 / 1000 * 20 = 882 samples.  Most audio devices do not allow  arbitrary buffer sizes but offer an array of choices, so we would select  the closest option.  The device I'm using right now offers 512 and 1024  samples as the closest available buffer sizes, so I would select 512  first and see how this performs.  If my session has a lot of tracks  and/or several effects, I might need to bump this up to 1024 if I  experience dropouts.
    Now that we hopefully have a pretty  firm understanding of what constitutes latency and under what  circumstances it is undesirable, let's take a look at how we can reduce  it for our needs.  You may find that you continue to experience dropouts  at a buffer size of 1024 but that raising it to larger options  introduces too much latency for your needs.  So we need to determine  what we can do to reduce our overhead in order to have quality playback  and recording at this buffer size.
    Effects: A  common cause of playback latency is the use of effects.  As your audio  stream passes through an effect, it takes time for the computer to  perform the calculations to modify that signal.  Each effect in a chain  introduces its own amount of latency before the chunk of audio even  reaches the point where the audio application passes it to the audio  device and starts to fill up the buffer.  Audition and other DAWs  attempt to address this through "latency compensation" routines which  introduce a bit more latency when you first press play as they process  several seconds of audio ahead of time before beginning to stream those  chunks to the audio driver.  In some cases, however, the effects may be  so intensive that the CPU simply isn't processing the math fast enough.   With Audition, you can "freeze" or pre-render these tracks by clicking  the small lightning bolt button visible in the Effects Rack with that  track selected.  This performs a background render of that track, which  automatically updates if you make any changes to the track or effect  parameters, so that instead of calculating all those changes on-the-fly,  it simply needs to stream back a plain old audio file which requires  much fewer system resources.  You may also choose to disable certain  effects, or temporarily replace them with alternatives which may not  sound exactly like what you want for your final mix, but which  adequately simulate the desired effect for the purpose of recording.   (You might replace the CPU-intensive Full Reverb effect with the  lightweight Studio Reverb effect, for example.  Full Reverb effect is  mathematically far more accurate and realistic, but Studio Reverb can  provide that quick "body" you might want when monitoring vocals, for  example.)  You can also just disable the effects for a track or clip  while recording, and turn them on later.
    Device and Driver Options: Different  devices may have wildly different performance at the same buffer size  and with the same session.  Audio devices designed primarily for gaming  are less likely to perform well at low buffer sizes as those designed  for music production, for example.  Even if the hardware performs the  same, the driver mode may be a source of latency.  ASIO is almost always  faster than MME, though many device manufacturers do not supply an ASIO  driver.  The use of third-party, device-agnostic drivers, such as  ASIO4ALL (www.asio4all.com) allow you to wrap an MME-only device inside a  faux-ASIO shell.  The audio application believes it's speaking to an  ASIO driver, and ASIO4ALL has been streamlined to work more quickly with  the MME device, or even to allow you to use different inputs and  outputs on separate devices which ASIO would otherwise prevent.
    We  also now see more USB microphone devices which are input-only audio  devices that generally use a generic Windows driver and, with a few  exceptions, rarely offer native ASIO support.  USB microphones generally  require a higher buffer size as they are primarily designed for  recording in cases where monitoring is unimportant.  When attempting to  record via a USB microphone and monitor via a separate audio device,  you're more likely to run into issues where the two devices are not  synchronized or drift apart after some time.  (The ugly secret of many  device manufacturers is that they rarely operate at EXACTLY the sample  rate specified.  The difference between 44,100 and 44,118 Hz is  negligible when listening to audio, but when trying to precisely  synchronize to a track recorded AT 44,100, the difference adds up over  time and what sounded in sync for the first minute will be wildly  off-beat several minutes later.)  You are almost always going to have  better sync and performance with a standard microphone connected to the  same device you're using for playback, and for serious recording, this  is the best practice.  If USB microphones are your only option, then I  would recommend making certain you purchase a high-quality one and have  an equally high-quality playback device.  Attempt to match the buffer  sizes and sample rates as closely as possible, and consider using a  higher buffer size and correcting the latency post-recording.  (One  method of doing this is to have a click or clap at the beginning of your  session and make sure this is recorded by your USB microphone.  After  you finish your recording, you can visually line up the click in the  recorded track with the click in the original track by moving your clip  backwards in the timeline.  This is not the most efficient method, but  this alignment is the reason you see the clapboards in behind-the-scenes  filmmaking footage.)
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    There is one point in the above that needed a little clarification, relating to USB mics:
    _durin_ wrote:
     If  USB microphones are your only option, then I would recommend making  certain you purchase a high-quality one and have an equally high-quality  playback device.
    If you are going to spend that much, then you'd be better off putting a little more money into an  external device with a proper mic pre, and a little less money by not  bothering with a USB mic at all, and just getting a 'normal' condensor  mic. It's true to say that over the years, the USB mic class of  recording device has caused more trouble than any other, regardless.
    You  should also be aware that if you find a USB mic offering ASIO support,  then unless it's got a headphone socket on it as well then you aren't  going to be able to monitor what you record if you use it in its native  ASIO mode. This is because your computer can only cope with one ASIO device in the system - that's all the spec allows. What you can do with most ASIO hardware though is share multiple streams (if the  device has multiple inputs and outputs) between different software.
    Seriously, USB mics are more trouble than they're worth.

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    Message was edited by: J A Bohrer

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    Message was edited by: J A Bohrer
    Message was edited by: J A Bohrer

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