New Ram wont work

Hi,
I'm running Windows Xp pro on a Dell Dimension 2400 Desktop.
The maximum Ram for this system is 1gig.

I Have the original 256MB, DDR,333,CL2.5 (PC2700U-2531-A1) that came with the system a couple of years ago. I'm trying to add 512mb Kingston memory.
KVR400/512R
512mb PC3200 CL3 184-Pin DIMM

The PC won't boot up or anything when I add the new ram..also it doesn't work if I try it with just the new 512ram. Have tried both slots.
I also have tried: K-Byte 512MB PC2700 DDR Memory
With the same results. I ended up returning that RAM. Each person at each store that I made these purchases(Staples & Office Max)...both said it would work. The diagnostic lights on the back of the Dimension 2400 are showing an error. The light colors showing mean: Memory modules are detected, but a memory failure has occurred.
I've tried cleaning...also taken ram out (old ram) putting old and new back in,...trying different slot. As suggested on another site, I removed the CMOS battery and then put back in....still the computer will only work with the old ram stick . I have noticed that when I try the new ram either alone or with the old..that the power comes on the computer for about 5 seconds..then goes off and comes back on...but never making it to display anything on the monitor.

I've been careful to make sure not to cause any ESD to the computer


I'm at a loss as what to do now.
Does something in the bios have to be changed?
I'd call myself " novice/intermediate,"

I havent been able to find answers on the Dell website. Any input/advice would be greatly appreciated.

Thanks

 

[EDIT] @ Jaymes...I'll only bring this to your attention once ---> Read This [/EDIT]

 

Hi Halo,
The Kingston 512 Ram is a Value Ram stick. The sticker on the Ram has several different numbers. I don't know which one is the part number ...so here are the numbers that are there:

99R0012-002.A01
P790061-686013

KVR400/512R
740617076349
2.6v



AEPE1610619

076349TW0P790061


On the box it came in it just says:
KVR/512R
Memory Upgrade Module
512MB PC3200 CL3
184- Pin DIMM

Then the bar code number : 076349TW0P790061
I can't seem to find it on the Kingston website.
If need be, I'll return this one and hopefully be able to find one that will work with my system. So if I get a different one that will work with the 256MB ...is this all I have to ask for :
PC2700 512mb ram at CL2.5 ?

Thanks

 

Did check with dell to find out what type of memory your computer takes?

 

Thanks for the info. I returned the Ram and now will look for another 512mg stick. I havent decided if I should order online or try searching around locally. My concern is : if I buy online and it doesnt work, is it going to be much of a problem trying to return it?
If anyone has any advice/suggestions on buying ram online I'd like to hear.

Thanks for the help

 

I ended up purchasing a PNY 512mg PC2700 DDR RAM ......works really well...computer recognized it right off and its working beautifully!! No problems at all !

Thanks for all of the time, advice/input.