Apple iMac 21.5 in. (MC413LL/A) Mac Desktop - with Front Row

This computer supposedly large. "The screen was 21,5 inches" so writes publicist who lends Apple iMac is through instant messenger. But in fact when the total weight (plus packing computers and accessories) are not as heavy as I anticipated.
When unpacking the package I found a box with a keyboard, mouse, remote control, and the OS X installer DVD In addition there is also a cable to the power supply. But the one that controls the contents of the package is a form object that seemingly looks like a computer screen. I plugged the keyboard, mouse and power supply, then turn on the iMac.
 "Where is CPU?" Once remarked my colleagues see this computer. They were astonished because this computer seemed to run with the monitor, keyboard and mouse alone. Apple iMac design was indeed unique: all the components used to put in a box called CPU integrated into the shell of the monitor screen. This also includes all ports (USB, FireWire, VGA, DVI), Bluetooth and Wi-Fi. This design was first introduced in Apple iMac. But the computer that was lent to me this was switched to an Intel Core 2 Duo 3 GHz.