I've never used this type of converter. Is there a place on it to set whether the converted drive appears to be the Master or Slave on the IDE channel? I would presume the plan is to make it the Primary channel Master, which likely would become the C: boot drive.
Is there a choice in the BIOS Setup Main Menu for Auto-detecting a hard drive? Sometimes running this built-in utility can force the BIOS to examine the HDD and figure it out.