无法开机，按下开机键后，黑屏，只有很大的风扇声。

Can you check the clock in the host? I did the same thing last time
The clock in a computer typically refers to the internal clock system that synchronizes various operations, mainly including:

1. System Clock: This is a clock circuit on the computer's motherboard that generates a frequency signal (usually ranging from a few MHz to several GHz) to synchronize the operation of different components of the computer. For example, the CPU, memory, and other hardware devices rely on the system clock to ensure coordinated operation.
2. Real-Time Clock (RTC): This is a separate clock chip used to keep track of the date and time, even when the computer is powered off. The RTC typically runs on a battery, so it can maintain the time accuracy even when the power is disconnected.
3. Clock Speed: This refers to the number of instructions the computer processor (CPU) can execute per second, usually measured in hertz (Hz), such as GHz (gigahertz). It is an important metric for measuring the CPU's processing power.

The clock in a computer is crucial for ensuring that various parts of the system work in harmony. It is involved in processes like data transmission and instruction execution, with clock signals playing a role in synchronizing these activities.