Hello, I think you might find more information on starting up the DL380 G2 at the link shown below:
Also, the replacement instructions, in case it needs to be replaced, (and relevant troubleshooting info) for the 5i controller
are found in the link here :http://h20566.www2.hpe.com/hpsc/doc/public/display?sp4ts.oid=316587&docLocale=en_US&docId=emr_na-c00688182
Please first make sure that you are using the proper startup boot disk for the server before entering the CD ROM option from the boot menu. Also, check the front panel of the SCSI drives for any errors or blinking LEDS that correspond to an error code. You can run a diagnostics CD/DVD that arrived with the manufacturer's pack to detect any raid issues on startup.
If you are still facing difficulties with booting up the server, you can find a video for replacement of the appropriate scsi drive here if you are still facing any issues of your scsi drive. Try a different hard disk or check the relevant diagnostics to verify whether is the controller or the drive that complicates the booting of the server
For more details check the scsi manual in the link below (section "FBWC LEDs" , pages 15-17).