How do I replace a bad RAM chip on my Mac Pro?

When I start up my Mac, I keep getting a window that tells me to restart my computer. I've run Disk Warrior and saved my files to an external hard drive, but I still get the little black window telling me to restart my computer. No matter what I do. Now, I can't even run Disk Warrior again. The tech people at Alsoft say that it's very possible that my RAM chip is bad, and that it needs to be replaced. How do I do that? And where do I get RAM chips?

Before replacing RAM chip, you'd better check them with Apple Hardware Test or memtest OSX.
http://www.memtestosx.org
Memory sticks are available at OWC or Amazon, though it depends on your Mac Pro model.
http://www.everymac.com/systems/apple/mac_pro/index-macpro.html
http://eshop.macsales.com/shop/memory/Mac-Pro-Memory
How to install RAM stick video in Mac Pro.
http://eshop.macsales.com/installvideos/

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