Same ram cards, only one slot works at a time

After about a week of digging around online and a couple frustrating phone calls I'm at the end of my rope. I have a eMachines w3507 500, the ole walmart couple hundred special. I bought two kingston kvr667d2/1gr for my pc as per the instructions of one of the insane amounts of sites I've been to throught this fiasco. What happens is that when I install one card into either of my two slots the other slot goes unrecognized. I've tested both the memory sticks and the slots and all appear to be in working order aside from the fact that only one of the two slots will read at a time. I did notice ion my BIOS that I'm running single memory mode or something to that effect with no option to switch to dual, but I'm unsure if that would make a difference. Before anyone asks, I'm pretty sure that the cards are seated correctly.
If anyone has any advice, I'd appreciate it. This close to christmas with 4 kids I really don't have the cash to go buy a single 2g card which appears to be the only solution I can come up with on my own.
Thanks for your time,
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  1. That system won't accept a single 2GB module. I checked several sites and it takes DDR2-533 double-sided memory modules, but you bought DDR2-667 modules.

    As you can see, Kingston don't list that kit for your system:

    You should buy a kit from a site that certifies it will work in that system.
  2. thanks for the reply, I guess I should have bought the cards from the site rather than try to catch a deal.
  3. Even if I don't purchase from I always check their site for what's compatible, maximums, etc...
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