found this on another forum hope it helps:-I had the exact same problem and this was the right solution. But I'd like to clarify a few things for other people who get a little nervous poking around in the bios settings.
Obivous things first, you get to the bios setting by pushing F2 on the first screen that appears when you boot up.
The actual setting you change is called primary 1. This is the slave/second HD that you plugged into the middle connector on the IDE1 cable. You need change this to auto by hitting the spacebar. At first the bios will call it unknown device, but it will update the next time you restart.
Primary 0 is the master drive that gets plugged into the last connector on the IDE cable. I was a bit confused about this at first because there are also secondary drives 0 and 1. But these are the cables for the cd/dvd drives.
Hope this helps for people are not so familiar with bios settings