New HD not recognized - computer won't start

Powermac G4 MDD
Originally had 2 hard drives -- 60GB (jumpered as master) and 40GB (jumpered as slave)
The 40 GB failed and the 60 GB was diagnosed as failing so I purchased used Seagate 160 GB ATA/100 Hard drive
I installed the new 160 GB Hard drive in place of the 40 GB HD and used SuperDuper to clone the still working 60 GB drive. The files were all copied to the drive and the drive showed up on the desktop as a hard drive icon, and it was recognized in the System Profiler. However, I could not select it as the startup drive from the System Prefs window.
I then took out the 60GB drive and replaced it with the 160 GB drive jumpered as cable select and now the computer won't start up (flashing question mark).
What have I done wrong?

I read through all this and still have some trouble. The article says that in Disk Utility if I select the drive a tab named "Partition" will appear at the top of the window among the other tabs. It doesn't.
I noticed some differences in the spec for the 2 drives currently in the machine: specifically, the new 160 gb drive is formatted (right word?) as GUID not AMD as the old drive is. But I can't figure out how to access that "partition" option and make the change. Here are the spec from System Profiler:
160GB Drive:
ST3160812A:
Capacity:    149.05 GB
Model:    ST3160812A
Revision:    3.AAE
Serial Number:    5L****J3
Removable Media:    No
Detachable Drive:    No
BSD Name:    disk0
Protocol:    ATA
Unit Number:    1
Socket Type:    Internal
Low Power Polling:    No
Mac OS 9 Drivers:    No
Partition Map Type:    GPT (GUID Partition Table)
S.M.A.R.T. status:    Verified
Volumes:
Seagate 160GB Drive:
Capacity:    148.73 GB
Available:    111.35 GB
Writable:    Yes
File System:    Journaled HFS+
BSD Name:    disk0s2
Mount Point:    /Volumes/Seagate 160GB Drive
60 GB Drive:
ST360021A:
Capacity:    57.27 GB
Model:    ST360021A
Revision:    5.21
Serial Number:    3H****4N
Removable Media:    No
Detachable Drive:    No
BSD Name:    disk1
Protocol:    ATA
Unit Number:    0
Socket Type:    Internal
Low Power Polling:    No
Mac OS 9 Drivers:    Yes
Partition Map Type:    APM (Apple Partition Map)
S.M.A.R.T. status:    Verified
Volumes:
60GB HD Mac OS:
Capacity:    51.26 GB
Available:    12.73 GB
Writable:    Yes
File System:    Journaled HFS+
BSD Name:    disk1s9
Mount Point:    /
<Edited By Host>

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