This mb is an Intel D815EEA Put this unit together a month ago Has the latest bios P11 Has ran fine It has Intel Ac 97 on board sound This morning I lost the sound Checked and it said no device was installed Device manager showed an error for AC 97 codec Un & reinstalled no good (tried realtek same) Then I rebooted to go into bios And on the boot menu right it finds the cd(normal to that point) I get the error message "Illegal AC'97 configuration Ac'97 Modem fuction disabled" There it stops unless I go F1 to resume and it boots normally Or F2 and go to the BIOS No mention of a modem in the bios I do not have a modem and none shows up in the device manager I reinstalled bios, took out cmos battery cleared bios turned off onboard sound stiil same error( no on board modem) onboard stiil same error Put in a sound card no problem and there is no Intel ac97 audio codec showing in the device manager no errors in the Device manager But when I reboot I get the same error so I preess F1 and it stars and runs good. 500 watt ps 1gigP3 512 pc133runs cool 37C. Ati 8500Agp No errors on hard drive No answers At Intel or searches i dont mind having a sound card but I would like it to Boot all the way Thanks for your help