Second hard drive installed but fails to appear in disk utility

I have installed the original 160GB into the second HD bay of my Dual 1.8 G5, and have had little success of it working. I say little success because one time (not the first time) it appeared on the desktop and I was able to view and run apps. from it. However, with each additional boot it has not been visible on the desk top, system profiler, or disk utility.
?Why did I install the original Hard drive in the second bay?
Just before leaving the country I sold my mother this computer, just before delevering the computer it crashed to catastrophie. She took the computer to
a certified apple repair facility, and they removed the drive, and installed a new drive in HD bay 1. In addition, they sold her an external firewire case that which the original drive could be installed in and therefore connected to the G5.
I would rather work through this problem than use the external drive, so Please Help.
power mac G5   Mac OS X (10.3.4)  

I am having the same trouble with my G5! You are not alone but I am also trying to get the answer to our problem.
Would someone please help us with this problem?
Thanks in advance.
Arnold

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