HT1712 Resetting the PRAM and the apple screen???

How long does it take to load back up after resetting the pram? It's been on the gray apple screen for some time now.

1.) Under Energy Saver: I specified not to ever put my computer to sleep, however, there is a checkbox for putting the hard disks to sleep when possible. What is the difference?
One's the computer (i.e., the operatinng system stored in memory), the other controls the physical HDs.
2.) After specifying not to put my computer sleep, I went to the login screen using fast user switching and there is still a sleep button on the login window. I am guessing that this is to put the computer to sleep and not the display.
Probably. As I stated earlier, I don't use FUS, so don't know its functioning WRT to sleeping. 
How can I put the display to sleep at the login window? I want to make sure that it at the login window so if I leave the computer I do not need to worry about anyone waking up the display and having access to it.
AFAIK, you can't. Waking up the display doesn't give access to the computer when it's at the login window. If you could put it into a state wherein you couldn't wake the display, how do you suspect that you'd be able to login yourself?
This is all I have time for today. If these replies helped/fixed your problem, please mark them appropriately. Good computing.

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