Hi Jay
this is a toughy because i am unsure the type of motherboard you have also if it is new or old -
well when you inserted the USB card it may have caused a IRQ conflict - hence the continous beeps but if the machine does not work at all but the fans are whizzing etc check your graphics card and monitor connections it is more likley the confliction occurred with the graphics card. you must remember to ground yourself when working inside a PC static can cause loads of problems hope that helps
Bally1981
January 2008