Replacement iMac hard drive not an option for "restore from backup"

Got my iMac back from Apple today with a new hard drive following a hardware failure. Unfortunately, I cannot restore from Time Machine as the internal drive is not listed as a choice for "Destination". My Firewire drives are visible but the internal drive is not. It wasn't visible at the initial attempt to restore when the drive was under factor fresh OS installation, it wasn't visible after partitioning the drive, and it wasn't visible after repartioning into a single partition. Any advice or ideas/explanations?

In your "Applications" -> "Utilities" folder you'll find a utility named "Migration Assistant".
Migration Assistant was originally created for Mac owners who buy a new Mac and want to migrate all their data over to the new machine. But it turns out this is exactly what you do when you do a full restore from a Time Machine backup to a new/empty disk.
As a result, Migration Assistant was updated since they came out with Time Machine so that one of the options is "From a Time Machine Backup or other disk".
Choose that option and it should let you do your backup (it'll ask you what you want to restore... user accounts & folders, apps, etc.) You probably just want to have it restore everything.
When you get a new disk you really don't want to run Time Machine interactively to pick the restore. The interactive mode was really designed to help you search for subsets of files to restore (when you're missing just one or two things). You'll be missing a LOT if you try to do a restore that way.
There are some caveats... since you probably already created a user account without doing a restore first, you probably already created an account with the same name that you had before. Migration Assistant wont let you do a full restore overwriting an existing account. You can get around this by creating a temporary account (and flag it as an 'administrative' account), then delete all other accounts on the fresh hard drive. Now when you do the Migration you will have no conflicting accounts and all will go as expected. You can then delete the temporary admin account when you're done.
Time Machine should figure out that the backup does belong to your current machine BUT that the disk being backed up is NOT the original disk. This will cause it to not trust that it can tell what data has changed since the last backup and forces something called a "deep traversal". A deep traversal means it will do a comparison of every file in the backup with the corresponding file on computer to determine if it's the same -- and this takes about as long as an original Time Machine backup (as if you deleted the whole thing and started a new backup) except you wont lose your backup history. Expect the first backup to take many hours to complete. After that initial "deep traversal" you'll get normal backup performance on all subsequent backups.

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    I too have experienced the "blame everything but Apple products/software" indoctrination of the Apple phone support techs!
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