PB 17" HD and RAM situation is grim

I've installed my Seagate 160 Momentus 5400.3 drive into my 17" PB G4. I took it to an Apple Authorized Repair Center to do so.
A couple of things:
1. My RAM went down from 1GB to 512MB for some reason.
2. When I try to Verify the drive from my Tiger DVD disc, it states an "illegal name" in red. So, I tried to Repair but it says "Error: The underlying task reported failure on exit".
I've tried repairing several times and get the same result. AppleCare said to reinstall w/o the Archive and Install. I did this at least 3 times and I STILL get the Error message when trying to repair the volume.
Is the HD defective? Should I return it for a new drive? It is bugging the heck out of me. Any suggestions about the HD or the RAM situation?
Well, I also did an extended Apple Hardware Test and this is the result:
Airport: Passed
Logic Board: Passed
Mass Storage: Passed
Memory: Error detected at startup (**note: this is before the test is run**)
*After the test has run: Passed
Modem: Device found
Video RAM: Passed
When I clicked on the Hardware Profile in AHT tab, I get this on the Memory:
Memory #1: 512MB
Memory #2: 512MB (but this is in RED) <---does this mean something is wrong?? Is it posswible he put it in backwards??
This is how I set up the drive: I formatted the drive, and installed the OS from the PB startup discs and then upgraded to OS to Tiger using a Tiger DVD. Just a fresh install, no archiving or anything. After reinstalling and Software Update, it still had the "underlying failure" blah blah problem. And now, I am going to do it again only this time, I am going to test the drive after each install and update to see if some software is causing it. I am really getting tired of this really fast.
Thank you for your help!

Hi,
I sounds like the RAM chip is either not seated properly or somehow got damaged as a result of poking around inside the computer. Problems with the RAM can cause hard drive problems, too, so that might be the cause of your problems with the disk.
I doubt the tech got the RAM in backwards, though, since all the RAM I've ever seen is "keyed" and it can only be plugged in one way to the slot. I've never looked at the RAM slots in the PowerBook, but I'd assume they're the same.
The hardware test is basically telling you it recognizes the RAM chip as present, but that it failed the initial Power-on self test. I wouldn't bother with any more OS installations until you get the RAM issue figured out. The fact that it passes after the test is run just means that the one chip passed. I'd bet it's just skipping the one that failed the Power on Self Test.
charlie

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