Part number CHSCBK001AAUS,CHSCBK002AAUS,CHSCBK003AAWW,CHSCBK004AAWW,CHSCBK011AAWW
This is the reset button. When the keyboard buffer is filled with keystrokes, the computer may not function. If pressing the CTRL+ALT+DELETE keys at the same time does not restart the computer, then a hardware reset is necessary. Locate the reset switch near the memory bay. Using a pen or a straightened paper clip, push in the switch to restart the computer.