Installed more RAM and the MacPro wont start

When i installed the new 1GB the computer wont come on - the light that usually tells you that the computer is asleep just keeps flushing...Has anyone heard of this? Am i supposed to take off the sticker (which indicates that the memory is no longer covered by apple care or something...) before i insert the memory?

Try these steps in order:
Reseat the RAM
Instructions located here:
http://docs.info.apple.com/article.html?artnum=303491
Reset the PRAM/NVRAM
Instructions located here:
http://docs.info.apple.com/article.html?artnum=2238
If still unable to turn on the computer, remove the new RAM and reinstall the old RAM, reset the PRAM and test.

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