单项选择题 A user reports that their touchpad no longer works on their laptop. Which of the following is the FIRST troubleshooting step?（）

单项选择题 A user reports that their hard drive has failed and needs to be replaced. Which of the following should the technician do FIRST?（）

单项选择题 A memory type typically used in high end workstations and not generally found in consumer gradePCs is:（）