I actually had a desktop motherboard, purchased about 2003-2004, that did this.
Mind you, as it slowly succumbed to age (capacitor plague, most likely), it would start repeating "No CPU Installed, No CPU Installed..." as I watched it boot without issue. Once the sound driver was configured, it would stop.
Mind you, as it slowly succumbed to age (capacitor plague, most likely), it would start repeating "No CPU Installed, No CPU Installed..." as I watched it boot without issue. Once the sound driver was configured, it would stop.