Horrible Line Noise w/ Built in Audio Input After Update!

Something happened after the most recent LE8 update, I now have terrible line level hiss/noises when using the built-in input on my MacBook Pro. No trouble with my Firewire audio input though. The noise is really bad and records to track, making me believe that this is an input issue. I'm not positive that it's from the update but I've never had this problem before. It happens with both Logic Express and Garageband, rendering the audio input useless. Anyone else having this problem?

Thanks for the response guys. It seems we're in the same boat.
The problem is intermittent on my machine . It has occurred three times since I bought it. The fist time it lasted for a day and a half. I rang Apple support and went through a number of steps until the P-RAM suggestion which seemed to fix it. A few days later it disappeared again and resetting the P-RAM had no effect. My wife continued to use the computer (without sound) and some hours later it came back after a restart (she only restarted it because she is in the habit of shutting down instead of using sleep). The problem occurred again. That time I restarted the machine a number of times, with and without the external speakers plugged in, with them turned on and off etc. This had no effect. I gave up. Some time later my wife went to use the computer and it came back. I now believe that the P-RAM solution that seemed to fix the problem the first time was just a coincidence.
I rang Apple support again and they gave me the following steps (A,B & C of which I went through the first time the problem occurred):
A: Log in through another account and see if it had the same problem.
- The built-in audio was still missing.
B: Run the disk utility on the hard drive (after booting from installation DVD).
- There were nil problems on the HD, but it did not fix the problem.
C: Reset the P-RAM.
- This worked the first time though it has not worked on subsequent re-occurrences of the problem.
D: Do an Archive Reinstall.
- I did this today; though the built-in audio was working, I just wanted to complete the suggestions the Apple support person gave me. The problem has not reoccurred yet, but it has only been a few hours. I will be using the computer as much as possible tonight to see if the problem reoccurs.
If the problem reoccurs I'll be taking the machine in for warranty repairs, or better still replacement.

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