HT1423 Purchased 2x2GB Memory modules, and installed . No dock , no Menue bar??

What to do??? Purchase from Apple On-Line store 2x 2GB memory module. at appears iMac does not regognice the new memory.
Mac OS X asking for pass word, still running on Snow leopard.

You probably followed these steps to install the memory: http://support.apple.com/kb/HT1423
Since you have an Intel iMac, reset the SMC and PRAM:
SMC:
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
PRAM:
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
If the iMac doesn't recognize the newly installed memory after doing that, reseat the memory and reboot.

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