funny problem about sound

i've so many problems for getting sound from this mother board, and i've getting the last one (i hope),
(intel D975xbx2)
first that famus "error" i had, which i read everywhere on the net, the UAA bus driver ,i downloaded it and install, the problem fixed and i had a clear bright sound !!
the problem i've getting now is when i shut down computer for about 30 min , then i power on , the windows do not detect any sound device like it hasn't any (all the things go grey), and so on after 3, 4, 5 reboot sound came back !! it is like old radios that they should "warm up" before working !
it is just like my motherboard should warm up to give the sound !
anybody knows what is THIS problem???
(another thing to mention is if i unplug any cable in the case the sound would work, i've unplugged the case HD audio cable, if i plug it now i can get the sound , if i have no sound and this cable was plugged the last time , so if i unplug it, then i would get the sound!)
please help !
(the last time i've tried was this, after 6,7 hours i power the pc on , obviously i didn't have sound (no audio device detected), i reboot 3,4 times , still no audio , then i switch it off , after 10 sec , i switch it on , the sound was back ! i hope it isn't hardware problem , i think if it is i would have problems during the the time i'm sitting at my pc)
any help would be so helpful!!!!