IMac keeps crashing after RAM upgrade

I used the website crucial.com to max out the RAM in my iMac. I ordered the RAM they said was for my computer but ever since I have installed it it seems my mac crashes almost on a daily bases. Sometimes its when openining an aplication. Sometimes its when coming back from screen saver mode. When it crashes everything on the screen freezes including the mouse. On occasion the screen will just go grey or black and be unresponsive. How can I fix this? What could the issue be? I keep my iMac updated when it tells me to update but what can be done?

Yeah, sounds like classic symptoms of a bad stick. Odd that crucial send you a bad one- they're usually pretty good. Happens occasionally to anyone though, I suppose. I suspect they'll probably be willing to replace it.
If you got two sticks, maybe you could try booting the mac with one at a time, it's probably only one stick with the failure.

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