No sound at some starts

Hi,
it's happen twice. I start the computer, it chimes ok, login with my user and I don't have the sound icon in the menu bar. The built-in Sound is ok in the system profiler and in the system preferences in sound I get no input or sound devices. I restar or shut down the computer and the sound comes back (most of the times) in the system log this error shows:
Mar 21 10:18:58 localhost kernel[0]: Sound assertion "1" failed in "AppleOnboardAudio/PlatformInterfaceI2C_PlatformFunction.cpp" at line 328 goto handler
Mar 21 10:18:58 localhost kernel[0]: ^PSound assertion "!result" failed in "AppleOnboardAudio/PlatformInterface.cpp" at line 138 goto Exit
Mar 21 10:18:58 localhost kernel[0]: ^PSound assertion "!mPlatformInterface->init ( provider, this, AppleDBDMAAudio::kDBDMADeviceIndex, mPlatformInterfaceSupport, irqEnableMask )" failed in "AppleOnboardAudio/AppleOnboardAudio.cpp" at line 3076 goto Exit
Mar 21 10:18:58 localhost kernel[0]: ^PSound assertion "!result" failed in "AppleOnboardAudio/AppleOnboardAudio.cpp" at line 173 goto Exit
Mar 21 10:18:58 localhost kernel[0]: ^P
I've seen in another forum that somebody fixed it reinstalling the 10,5,2 combo update but when I tried it, it says i don't meet the requirements.
Also I've tried plugging in a pair of headphones and nothing happens.
Any ideas?
PowerBook 15" 1.5 GHz Leopard 10.5.2

Yup. My console message looks like this:
Jul 17 13:17:03 Musa kernel[0]: Sound assertion "0 != result" failed in "AppleOnboardAudio/AppleOnboardAudio.cpp" at line 7323 goto Exit
Once I restarted and I had simply no audio at all: the volume icon I keep in my system menu bar was greyed out, and when I ran System Profiler, it said I had no audio support! I ran the hardware test from the CD, and it found nothing. After I restarted, all was well. However, I restarted my PowerBook this morning for an unrelated reason, and now the volume icon in the system menu bar isn't greyed out, but I saw it was set to the maximum, and when I tried to lower the volume, I noticed that the control itself for adjusting the volume was greyed out. When I went into Sound in System Preferences, I saw this:
The question I have is this: is this a hardware or a software problem?

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