I changed my resolution to a setting that the monitor can not handle.
i run sli 6600gt on an Asus A8n-Sli deluxe mobo.  
From start up i cannot see whats on the monitor including the starting bios.
What should i do ?
I also do not know if this is the correct section to post this problem.

Send it to the repairman. I guess the monitor's broken.

Try the computer on a second monitor, or try the monitor on a second computer.
 
Also, try unplugging the monitor for an hour or so, then plug it back in.
 
I bet you've already tried those... >.>