Cisco config file saving issue

I have two cisco routers. one is a 1700 series and another is a soho mocel. and both after i setup configs and save via copy run start, after a power down the router still goes into the menu setup options and even after i decline to go trhu it the configs are gone. Why is this?
jonnydollarAsked:
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JFrederick29Commented:
The config register needs to be changed to 0x2102.

conf t
config-register 0x2102
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jonnydollarAuthor Commented:
JFrederick29:

you are correct. what purpose does that setting serve?
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JFrederick29Commented:
It sets boot variables.  For example, the config-register was probably set at 0x2142 which tells the router to not load the startup-configuration on boot.  This is typically used for password recovery.  Most times it is forgotten to set the config-register back to 0x2102 which is "normal" boot.
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