Precision T5500 Quadro 2000 display port monitor won't autodetect when switch on CPU.

I have a Precision T5500 Quadro 2000 that I recently decided to have dual monitors.

So I connected my main display to DVI port and I used a display port > VGA converter for my second monitor. 

But each time I shutdown and turn my CPU on again, the second monitor which connected to display port won't auto detect. Even though I have tried to make my 2nd monitors as my main display. I can't find any setting in nvidia control panel that can help me solve my problem.

The only solution I have now is detach and replug in the cable everytime I switch on my CPU. This is quite troublesome and I wish there's a solution for me to have my dual monitors on each time I turn on my CPU.

Thanks