VM fails to boot ("OS not found") when 2nd disk is present

Akulsh used Ask the Experts™
VM fails to boot when 2nd disk is present. Rather than booting from hard disk, it tries NIC to boot up and soon "Operating system not found" error appears.
Everything is fine once I remove the 2nd disk. In boot options, hard disk is obviously the 1st option. Disconnecting NIC makes no difference. Strange!
Please advise.
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