Memory install problems with my iMac. Can someone help me?

I read several post before leave it my question here—like having similar RAM memory problems—but looks like nobody has the right answer. This is my dilemma.
I have an iMac/Intel Core 2 Duo/2.8 GHz/RAM 2 GB/800 MHz,(Anodized Aluminum) 1st Generation - Summer 2007 Family, and has many others here I bought an extra 2GB module in hope to boost the memory from 2GB to 3GB (the new 2GB memory module and the old 1GB).
I did the installation, making sure they fully seat into their sockets, turn on the computer, checking if the computer recognize the new memory module... and everything went right until I started working with the computer.
The first indication of a problem happen 15 min. after I installed the memory. The computer crash and I follow the normal procedures to restart the Mac. No problems for about one hour.
The second time the computer crash I was working an InDesign file, I did turn off and on the computer but this time it didn't work. There was no beep or other sound, nothing was shown on the screen. I took the new memory module out and replace it for the old 1GB.
Now is working just fine. Is this an Apple scam to make us buy expensive Apple memory modules? The module in question, the one that I bought brand new from memory.com for just $26—instead of the outrageous price of $100 from Apple Store—in as follow:
2GB DDR2-800 non ECC SO-DIM
This is the recommended module for iMac 2.8GHz Intel Core 2 Duo 24-inch at memory.com
http://www.memory.com/net/System.aspx?model=37204
I wondering if my problem could be the use of two different configurations (2GB+1GB modules) or is just a "conspiracy theory" that Apple want to make us buy expensive RAM memory.
If I bought a "wrong module", why the computer recognize the upgrade and I was able to work, at least for 2 hrs?

sergei63,
It seems you did not purchase the correct memory! The memory for mid 2007 iMac (first generation Aluminum machines) is:
667 MHz, PC2-5300, DDR2 compliant (also referred to as DDR2 667)
Look in your owners manual and you will find this information. As you are finding out your machine will not run if it has incorrect memory in it.
My suggestion is return the RAM you received and purchase the specification listed above.
Regards,
Roger

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