external DVD-ROM drive issue whether it is working or not?on HP rp74000

old clunker - rp74000

How to diag the external DVD-ROM drives issue whether it is working or not? on HP 9000 server rp7400
Please help me > I needed to install HP 11i v1 using external DVD-ROM drive on HP 9000 server rp7400. While boot in CO> �search� command is not showing DVD-ROM device only showing all disks > BOOT PO or P1 is not working. Showing some IPL errors.
After boot system on exiting disk OS, # ioscan funC disk are not showing DVD info.
I have multiple HPUX 11i dvds, I can able to mount them on other hpux system.
Thank

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