Speaker / Mic problems on Intel iMac

My problem punch list on my new 20 inch iMac. I have owned an iMac G4 and a Powerbook for many years.
- Volume keys on keyboard lock up randomly. Have to unplug keyboard and replug to get them to work again, then they lock up again soon.
-Won't recognize new RSL external speakers. Not indicated at all in Sound output.
-Won't recognize USB mic that I use on my other macs for Skype even when both Skype and Sound Preferences identify the mic and are set to it.
-iTunes won't play a song when USB headset is attached. When headset unplugged music will start and then when USB headset is reattached, it will play through it.
-If starting a new song, must repeat the same procedure to get it to play.
Anyone have any idea what inside the mac causes all of these sound problems?

Ok, Maybe this might help. I received my new Intel iMac two days ago. After I set it up I hooked up my 1st gen sound stick. Everything work great the first day. The second day I couldn't get any sound to come out of the sound stick speakers. Switch usb ports and rebooted several times and got them to work. Today the same thing. Call Apple Support and explained the problem. Support had me set up a user account. Didnot work. The last thing support ask me to do was to delete the Cache from the User Folder. Once I rebooted the speakers work fine even after mulitple reboots and shutting the computer down. So maybe you may have to do the same thing
iMac G5 2.0 Core Duo iBook 1.0 Mac OS X (10.4.4)

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I understand from your email that you are not able to print to your
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Hello.
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funnily enough I'm going the other way, I have a rack of external modules/>sampler/fx etc & a crate of looms I've just unplugged as they've not been >turned on in so long!!!
I hear you there!
The noise is there without any inputs at all to the interface, its defiantely >digital though, its like a toned version of the sound of an old telephone >modem.
What I mean, is try disconnecting everything, drives and all. You might even disconnect the interface and crank up the iMacs volume to see if it is there. If it is, you can try the UPS and see if that takes care of it. Then add them in one at a time. All it takes is one cheap power brick in the mix to cause all kinds of trouble (if your using powered monitors, that brick too). Noisy components can actually send noise back into the source power.
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Speaker / Mic problems on Intel iMac

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