重装Windows XP Professional SP3，系统提示无硬盘，无法安装！

电脑因运行较慢，于是重装。但重装时系统有如下提示：
Setup did not find any hard disk drives installed in your computer.

Make sure any hard disk drives are powered on and properly connected correct. This may involve running a manufacturer-supplied diagnostic or setup program.

电脑在此之前是可以用的，现在不仅无法重装，也无法启动使用。电脑有两个硬盘，分别拆掉一个也不行。请有经验的朋友帮忙给分析一下是什么问题，多谢！