CC 7100 cmt: questions upgrade ram cmt dc 7100 (please help)

Hey all,.
There is history... or you can just go to the section "cut to the Chase" to the bottom of the post

The long story...
my name is chris, and I'm trying to help a 14-year-old son, friends learn a lil more on his old pc.

his pc has a hand and is obviously outdated, I got a bunch of old carcasses of office and let him rumage anything that would contribute to his pc. We found a total of 3 GB of ram ddr400mhz which is just below its limit of 4 GB machines.

so I thought everything would go smoothly, it is certainly not my first ram upgrade, having built many of the old desktop computers it was inflict through, I consider myself pretty well informed on the pc and have renovated a lot of pc, same Freelancer my skills of mechanics and tokens for a lil extra cash on the side I have dealt with many a problem, repair and upgrade, since I took my first windows machine in 2000, before that I started with a commodore 64 and eventually got an apple iic when I was about 10 years old... anyway, what im getting here, is I USED to know my s#@t, but for some reason any It's evading me and google isn't offering anything on the subject.

We planned on him to update to sp3 after have modernized their equipment as much as we can, while at the same time educate him as much as I could about how the computer worked, how to open and how to treat the components inside, it was the first time, he had never looked inside his machine or any machine besides...

However, because of delays and the issue with the ram does not, I eventually send him home with the same stock set up, he brought to me.

Cut to the Chase

The problem here is that for some reason when I install 1, 2 or 3 the cards of ram 1 GB the machine do not post and triggers a series of beeps system, so obviously something isn't jiving, and I can't put my finger on it.
I can use 1,2,3 or all 4 of his stock [256 MB ddr 400 mhz] ram cards and it will display and start with change messages memory clear system, however, when you use less than four of its ram slots, a message is launched upward during post, stating something to the effect of all the slots must contain the same amount of ram

We are working on PC is a:
HP DC 7100 CMT
Windows XP SP2

current installed RAM is [256 MB ddr 400 mhz] x 4 = a total of 1 GB

tried to upgrade RAM parts:
Ballistix [1 GB ddr 400 mhz] x 2 = a 2 GB total

more

Memory Dell [1 gb ddr] (mhz are not)

I thought it was probably a bios thing and was about to investigate, but we ran out of time, now I'm tender hand to this community in the hope that someone here can indicate what it is I'm obviosly dominant, I really want to get his machine is upgraded because it is expessing a lot of interest in Unity3D , and scripts, ANDS I'd like see hiw cultivate these skills and I can't buy a machine, and he cannot afford a new machine, so the upgrade of its rigging with these old quarters would be the most ideal situations for him, if we cannot find out we will simply create a new rig out of my 'old' , but the 3.0 ghz core dou in his dc 7100 cmt processor is probably better than any of the alternatives in my attic... so yes this is my dilemma and I hope that some here is kind enough to point me in the right direction

Thank you and best regards,
Chris

Hello:

You must have the total amount of memory in slots 1 and 3 are the same, and the same quantity in slots 2 and 4.

The PC will not work if you put 1 GB in slot 1, 1 GB in slot 2 and 1 GB in the Groove 3 because you're short 1 GB in the empty slot 4 and just short of 1 GB in slot 4 = 5 beeps.

Then... If you do not have 4 x 1 GB then use 1 GB in slots 1 and 3 and 256 MB in slots 2 and 4.

See the table below on page 16 memory configuration.

http://WWW8.HP.com/h20195/v2/GetDocument.aspx?DocName=c04287187

Tags: HP Desktops

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