unable to install nor reset PRAM get lock on the screen

i am unable to reinstall OS X I've pressed C and it will not upload after 5 minutes it will go into my desktop, and side i dont remember my password i am unable to run. As I try to reset the PRAM, i will only hear 1chime and the lock appears on the screen. Please help1

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thank u dan i discovered and put it to use, with that said its completely functional.

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Take one bank of RAM out and restart

You can also boot up under the grey CD/DVD the system came with and under the utility menu you can reset the systems password that way.

As to re-installing/upgrading the OS make sure you have the correct version.

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edie will be eternally grateful.
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