I am using Dell 23" U2312HM IPS monitor. It just age 1 month.
1 problem that I am facing is the monitor unable to display when:

1.) After the windows 7 logo finish load, the screen normally will blackout a while and enter "welcome" screen right? however, my monitor unable to display at that blackout moment until my desktop being loaded.

2.) When gaming, I shift between tab. It unable to display too. I need to on and off the monitor power button then only can display.

Anything wrong to my monitor? Btw I am using DVI-D, I tried DVI-I also same.