Monitor Turns off System Freeze

Hey everyone,
Unfortunately I am back with another problem. I had been running a very stable system with no problems for a very long time but recently my system developed a problem without any changes to hardware or software.
Randomly my monitor began to go into sleep mode (sometimes while running applications others while just running idle on the desktop). I would try and turn the monitor off and then back on again but it would go right back into the sleep state. The system would still be on (I dont know if it locked up or not, but i think it was). When I hit the reset button sometimes the monitor would come on and then would work fine for a boot or two before I would experience the problem again or the monitor would not start at all and the system hung in the boot process.
In a couple early instances I recieved an error message (in windows after a reboot) saying that there was a problem caused by my graphics card. So I swaped out the 6600gt with an older 16mb TNT2 with its older nvidia drivers. I am experiencing the same problems with that card.
also a couple times right as I restarted the computer after one of these problems I got a blue screen that said there was a problem and had to be restarted with more information but it always restarted before I could read any more of it.
Currently I removed one stick of ram to see if that has something to do with it.
Does anyone have an suggestions on how to go about fixing/diagnosing this problem?

Sorry Glenn, I should have read my own post. What I meant to say was that, I do NOT know how a bad monitor could cause boot problems.
After removing one stick of ram I have still experienced the problem. The monitor went black and the light on it went orange. If I unplug the monitor and plug it back in it turns on then goes right back into standby. I plugged in a very old monitor and was able to get a picture (although messed up from what I think is either a driver issue or a bad old monitor) but I was able to move the mouse around and open folders. So, the system does not freeze when the monitor shuts off. I then restarted the computer with the test monitor and it booted into windows fine. However, the computer then froze seconds later. I still had a picture however. I do not understand if this is a related issue (I am thinking yes). Nor do I understand what this all means. I am incapable of figuring out what in the world all of this could caused by. Do I try a new monitor? Is it the computer power supply? Even though the power supply is less than 6 months old. How could a monitor affect the system like this? If the power supply in the monitor was going bad why would it work for a couple days then have the problem then go back to working again?
UPDATE:
So, I turned my computer off to put back in the other stick of ram since that stick can't be the problem. When I tried to reboot the computer I immediately received a beep then another then another. One beep every 5 seconds. Additionally, only the number 1 light (top left) on the d-bracket was green. I reset the computer and got the same response. So i unplugged it for 15 seconds and then hit the power button and everything was fine.
This is very frustrating but, please someone help me! Thank you.

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