Sandy's keyboard is not inputting data into her computer which key should she press to verify it is connected to her computer ... she should press what key and check the light on the keyboard

Windows key, capslock key for verify connectivity

Explanation:

Sandy's can verify whether her keyboard is working or not by pressing the windows key. Caps Lock and Num lock key will turn on the light on keyboard and she shall see whether her keyboard is functioning or not. This method is being used everywhere to verify the keyboard connectivity. The light function can also be checked by using Caps Lock or Num lock key as well. Some keyboard offers the in built light, which can be turned on by pressing Alt+Space bar.