Please help to write (small) script
 

Can somebody please help me out here...I'm on Mint 12 I need to make a script to load the following screen/TV particulars at startup and I haven't a clue where to start....

xrandr --newmode "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync
xrandr --addmode HDMI3 1440x900_60.00
xrandr --output HDMI3 --mode 1440x900_60.00

Obliged

In your case you could add them to /etc/rc.local, just make sure you add your three lines just above the "exit 0" line.

Monitor wont take the settings (even after setting the execute bit)......

rc.local is only run on boot (and runlevel change?) so there's a difference between the script not running (add "set -vx " on a line on its own about your xrandr commands, run script?), the commands running but not knowing what to apply it to (add "--verbose -display :0.0" to your xrandr commands) and the observation that "monitor not taking the settings" ('xrandr -q' should show).