I removed my LCD with Inverter, because it was broken. I'm using a Inspiron 4050 with a HDMI or VGA connected at TV, but the BIOS beeps(8times) continuos for ever and ever.
There is a way to control the beep volume or mute it through Ubuntu?
If Ubuntu is doing it, then the above answer is good. But "no monitor chipset" is a Dell BIOS beep code output.
Put in a cheap video card, maybe, the on-board chipset may be broken. You don't have to attach a monitor.
Failing that, physically detaching the PC speaker inside the case is a reasonable option.
The sound is most likely produced by the