Geo61c, The issue you are having is due to the raid driver not being loaded. You have a couple different options. You can download and burn this ISo to disk and boot to it - [URL] You may also boot to the OS media and then at the F6 prompt to load 3rd party drivers, you can present this driver file - [URL] Let me know how it goes.  
I have a 1950 and I am having a problem installing the OS the system has a Dell PERC6i SAS SATA RAID Controller. I have tried all the configurations for this controller and nothing helps. When I try to install the OS I get an error that the hard drives are not found. Both hard drives are working OK to the best of my knowledge. Could the controller card be defective? I purchased a new battery for it and I no longer get the battery low warning at boot. I removed the battery from the mother board to reset the cosmo. I have another 1950 and a 2950 both run fine. This one is driving me crazy.   Any help would be appreciated.  Thank You George
Power edge 1950 OS Install problem