重裝Windows XP Professional SP3，係統提示無硬盤，無法安裝！

電腦因運行較慢，於是重裝。但重裝時係統有如下提示：
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.

電腦在此之前是可以用的，現在不僅無法重裝，也無法啟動使用。電腦有兩個硬盤，分別拆掉一個也不行。請有經驗的朋友幫忙給分析一下是什麽問題，多謝！