2nd Screen Won't Register @ Startup

OK, anyone have this problem?

I have an iMac running version 10.6.2 with a 2.66 GHz Intel Core 2 Duo, 4gigs, 1067 MHz DDR3 blah, blah, blah...

I have a second screen hooked up as I do a lot of graphics stuff and use 2 monitors in my work flow.

OK, that all being said here's the problem...

EVERY time, and I mean every time, I start the machine it will not register the second screen. To get the second screen to be seen by the iMac I have to unplug the screen from the jack behind the computer and plug it right back in. Then and only then will the iMac recognize the second screen.

Is there any way I can get this darn computer to recognize that a second screen is present without unplugging it and re-plugging it to the back of the iMac??

Anyone... Bueller, Bueller?