Take out the new drive, put in the old drive, boot to CTRL-R, highlight the controller (upper-left corner), F2, Foreign Config, Import.
We have PE 2950. This server was used with some configuration drive and running well. Because of the running application on that server was not using again, we changed the installed drive with new drive and configured it with some raid configuration. But now, we need to access the old application, so we replaced again the installed drive with the old drive. But the server cannot boot with this old drive. What happened with our server? What we must to do? Please help... 
Please Help, How to recover installed drive?