A technician is replacing a processor in a workstation. After installation, the workstation starts up and immediately shuts down; the technician tries to start the workstation several more times and gets the same result. Which of the following is the cause of this issue?（）

• A、The workstation is not plugged in.
• B、The thermal paste was not applied.
• C、The memory was not installed properly.
• D、The L2 cache was not cleared.