Dear All, I have just built the following system: Antec Overture II (450W) Intel PD 930 Samsung 250 GB SATA II ASUS EN7600GT Zalman VF700-Cu vga cooler Zalman CNPS7700-Cu cooler 2x Corsair CM2X512-5400C4 DDR2 memory When it boots it gives me the annoying single beep, which means: Keyboard Controller error Refresh Time error No master drive detected The keyboard works perfectly The hard drive works perfectly (I am able to install and run Windows Vista) so I am guessing it has to be the refresh time error, but i have no clue what it means. CPU temperature is stable at 52 degrees Celcius and MB temperature is around 32 degrees Celcius. The system works without a problem, only that beep is annoying me up to the point of disconnecting the PC speaker from the MB. Does anyone have the slightest clue how to end the beep? Thank you, Ralph