> For the complete documentation index, see [llms.txt](https://book.bsdcn.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.bsdcn.org/bios/uefi-bios-gai-shu-yu-jing-gao/cmos-recovery.md).
# 设置 BIOS 后无法开机的处理方法（CMOS 简介）
本节介绍 CMOS 的基本概念以及在 BIOS 设置错误后如何恢复系统。
CMOS（Complementary Metal-Oxide-Semiconductor，互补金属氧化物半导体）原指一种由电池供电的芯片，用于存储 BIOS 配置信息（如时间信息、BIOS 密码和硬件设置等）。该芯片采用 CMOS 工艺制造，功耗极低，可由纽扣电池维持数据数月甚至数年。在现代 UEFI 系统中，系统的相关配置信息通常存储在非易失性 RAM（NVRAM）中，但出于习惯，人们仍将这种存储 BIOS/UEFI 设置的非易失性存储称为 CMOS。
清空 CMOS 可清除所有 BIOS 配置参数，恢复出厂默认设置。当 BIOS 设置错误导致系统无法启动时，可通过短接主板上的 CMOS 清除跳线、移除纽扣电池或使用专用按钮来清空 CMOS。具体操作方法因主板型号而异，可参考主板说明书或访问华硕官网（华硕. 主板如何 Clear CMOS\[EB/OL]. \[2026-03-26]. ）获取详细指导。
BIOS 是执行硬件初始化的固件程序，而 CMOS 是存储 BIOS 配置参数的硬件芯片。两者功能不同但紧密相关：BIOS 在启动时读取 CMOS 中的配置信息来初始化硬件。更多区别可参考联想官网（联想. BIOS 和 CMOS 有什么不同？\[EB/OL]. \[2026-03-26]. ）。
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.
Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:
```
GET https://book.bsdcn.org/bios/uefi-bios-gai-shu-yu-jing-gao/cmos-recovery.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.