linux启动不了了！

lihawk

错误信息如下：
Inter (R) Boot Agent Version 1.1.04
Copyright (C) 1997-2002 Intel Corporation
Client Mac Addr:00 30 .....       GUID: FFFF........
PXE-E53: No Boot Filename Received
PXE-M0F: Exiting intel boot agent

Inter (R) Boot Agent Version 1.1.04
Copyright (C) 1997-2002 Intel Corporation
PXE-E61:Media test failure,Check cable
PXE-M0F: Exiting intel boot agent
DISK BOOT FAILURE,INSERT SYSTEM DISK AND PRESS ENTER

我判断是硬盘或启动文件故障。可是怎么解决呢？因为硬盘上有重要数据，不能重装啊！