Dell SE198WFP 19" LCD won't come out of standby

I added a Dell SE198WFP 19" LCD to my old Dell XP system, and got the latest (only?) driver, 1.0.0.0
12/21/2006 . It works except for standby mode. My old control panel power settings turned off the monitor at 10 minutes, then put the system in standby at 15 minutes. The new Dell monitor does not wake up when I try to come out of standby. I have to power off the computer, then the monitor wakes during restart. I changed the power settings in control panel to never turn off the monitor, and still go into standby at 15 minutes. Now it hangs forever with the monitor displaying "Preparing to standby". It does not back out of standby if I hit a key, and it never proceeds to standby. The only way to recover is power off and on. How do I get the LCD to wake up when the rest of the system wakes (assuming the rest DOES wake now, I only see black screen.)