Old Memory/New Memory G5 issues

Hey guys. I'm new here so i want to say thanks for all of the help you Mac Gods of the message board.

I'll list what i have and what i have done to eliminate any guess work.

Problem: After installing my new Ram, only 1 gig shows up.

What hardware i have: Power Mac G5 2.0 late June with the 4 pci slots & 8 gig max memory slots. It has the original 250 gig H.D. and i just installed the 1T Hitachi SATA DeskStar 3.0 GB H.D.

What i've done: It had 4 GB of ram installed by the previous owner so i wanted to max it out with another 4. Bought this off of ebay....

2GB 2 X 1GB PC3200 DDR 400 PC 3200 2700 2100 MEMORY RAM - eBay (item 110330199830 end time Jan-24-09 09:12:08 PST)

...and did everything to get it to work until i found out that i needed the low density version. Thats getting shipped soon but in the mean time i put the new HD in and the memory back to where i think i had it.

Whats going on now: After the 'first' attempt with changing and moving the memory, i've never been able to get back the original 4 gb of memory. Did the basics of pairing up everything and putting them in their respective places. (slot 1 upper and slot 1 lower)
pressed and did the SMU reset on the logic board. I've taken out the memory and pressed them in to all **** like i was going to break the computer but i still get the one gb of ram reading.

What do i do now.

thanks.

Yep low density is the only option with a Mac. Whn you are looking for memory try OWC at this link and check out specs and price and do a comparison from there. OWC are Mac specialists with warranted memory.

Memory Upgrades for your PowerMac G5 Dual 2.0GHz 'Dual Core/Late 2005' (October, 2005) at OtherWorldComputing.com

Run Apple Hardware Test or Memtest over the memory to find out if you have problems. Also Repairing Permissions may assist after the high density ram was used.

Thanks harry.
Ive looked for the apple hardware test and see that you have to boot up from the #1 original disk. It says that you have to hold down the 'D' key on start up but that's for intel macs only. What do i do if i have a non-intel mac and running 10.4.1?

rick

'C' after the chimes......

And if X.4.1 is not a typo, try updating to X.4.11.

should i upgrade to the latest ox before i do anything?