Problems upgrading RAM in Satellite A105-S2236

I am working on a Satellite A105-S2236 for a client. It has Windows Vista basic - and only came with 512 MB of RAM, so it is very slow. I went through Crucial and got another 512MB chip for this computer - after installation, it still only shows 512 - I've tried switching the chips, running each chip individiually in both slots to see if 1 chip or slot wasn't working, and everything works great - except with 2 512 chips - it still only shows 512 RAM.
I spent a while on the phone with Toshiba - bascially for them to tell me that the motherboard is picky, and won't recognize 2 different brand of RAM chips. The 2 chips are completely identical specs, except the one that came in it is Samsung, and the new one is Crucial. I find it hard to believe that they won't work together.
Does anyone have any ideas?
Thanks!

Hello
You will not believe me but many people have reported about the same issue with Crucial modules. The best thing you can do is to send it back and buy known and good quality products. If you want to have one, order Kingston RAM module. They will work for sure.
Visit Kingston homepage. There you can find list of all compatible RAMs for your notebook model.

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