Monitor "no signal" during boot etc.

When I boot my computer and turn on my monitor at the same time, the monitor displays "no signal". However If I turn the monitor on later when the windows is already running, it's perfectly fine, no later issues until reboot. It usually do the job, when I unplug the cable, then I plug it in to the cards other slot or just plug it back. Last time, when I updated my geforce driver, my monitor did the same thing and I had to restart my machine 4 or 5 times before it worked again.

Hardwares:

LG W2453TQ Monitor
GeForce GTX 560 Graphics Card
ASUS P8H61 Motherboard

I'd really appreciate your help,
Deme