In the BIOS, under Integrated Devices, you should be able to enabled RAID. If that option is not there or not available to be changed (from SCSI), then the RAID components (key, memory, battery) are either not present or not functioning properly. If you can enable RAID, but you aren't getting a CTRL-M prompt, then something is wrong with the controller (on the riser card). Usually, if there is an issue with the controller it will either 1) give you an error during POST about the status of the controller, or 2) won't let you enable RAID in the BIOS. Turning off RAID (SCSI Enabled) will bypass any issues with the controller itself, and allow you to install without RAID ... or to avoid driver issues with the RAID controller, which may be the case, depending on your version of linux.
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