No, If I use other monitor on the same connection, the problem not appears.
On the Mitsubishi it appears on even pal or dblpal screemode too.
Turn on the machine, use it about an hour, presses CTRL+A+A and the computer resets, but not starts to load the WB. If I disconnect the monitor and press again CTRL+A+A the computer starts to boot. If I connect the monitor right after then, I can use it again until the next reset.