I have Linux Mint 13 KDE updated in my other partition.
I have an FullHD 23' monitor.
The problem is: When I turn on the computer and select LM13KDE in Grub menu the monitor turn off for a while (about 15 seconds) and then shows the KDE login.
I updated the KDE to KDE 4.9 and the problem continues.
I tried the XFCE 4.10 edition and the problem is not there. No problem with Mint 13 Cinnamon too.
Somebody help me. Its like the Kernel (or KDE) doesnt recognize the monitor for a while or just turn it off while running some scripts or bootmanager. I dont know what it is.