5 Replies Latest reply: Aug 28, 2011 2:34 PM by snood59
art101 Level 1 (110 points)
If this is covered elsewhere, please excuse the duplication and point me to a link or thread. Thanks.

This problem began out of the blue a week ago. Happens randomly -- sometimes everything is OK, sometimes the Mac Mini exibits the symptoms below. I haven't installed or changed anything. Anyone have any ideas?

Symptoms:
1. No startup sound.
2. System Profiler lists "No Built-in Audio" (when working OK, the list says "Intel High Definition Audio, Device ID 0x83847680, Audio ID 8, Speaker Connection: Internal, etc.).
3, External Logitech speakers plugged in, no sound. I unplugged them (when mini is working OK they're fine).
4. No volume control icon in Apple menu bar (when working OK, it's there and turned up).

Tried (no results):
Shutting down completely, waiting a few minutes and restarting.
Resetting PRAM (holding down Command-Option-P-R while starting up).
Used Disc Utility to repair permissions.
Used OnyX (excellent 3rd party utility which often finds things Disc Utility doesn't). Ran a full diagnostic with it... it found and repaired some permissions but noted no other hardware or software problems.

My best guess:
Motherboard dying?

Stats:
Mac Mini Intel Core 2 Duo, 2 GHz processor, 1 GB memory
OS X 10.5.8 (can't upgrade because 3rd party legacy software I use won't run on latest OS X)
Purchased Mac Mini in April, 2009

It's been a great little box but this is rather frustrating. Any help is appreciated.

Message was edited by: art101

Message was edited by: art101

Mac Mini, Mac OS X (10.5.8)
  • BGreg Level 6 (17,495 points)
    Have you tried an SMC reset:

    1. Shut down the computer.
    2. Unplug the computer's power cord.
    3. Press and hold the power button for 5 seconds.
    4. Release the power button.
    5. Attach the computers power cable.
    6. Press the power button to turn on the computer.
  • art101 Level 1 (110 points)
    Wow... thanks BGreg... never heard of anything like that before. I'll poke around and try your suggestion. I'll post back if it works. Thanks. Further, ever further.

    Message was edited by: art101
  • art101 Level 1 (110 points)
    Thanks much, BGreg. The problem hadn't happened for a few days; when it did, I tried your suggestion and it appears to have worked. I was previously unaware of resetting the System Management Controller (SMC). Your tip and the following link in the macosx.com forum might be helpful for others who run into this trouble or want more info about the SMC for Mac mini and other models...

    http://bit.ly/xzWXf
  • art101 Level 1 (110 points)
    The SMC fix seems to have worked. I hope this thread is helpful for other Mac mini users who run into this strange, annoying problem.
  • snood59 Level 1 (0 points)

    Great information. Works Thankyou.