Problem with the Black screen during boot up.
There is a conflict with the Asus BIOS and Windows 7. This occurs because the Operating system does not use the Netbooks screen as the first option during the login phase.
Quick Fix:When the black screen has been displayed for a short while, lightly press the power button. This puts the Netbook to sleep. Lightly press the power button again wakes the Netbook and displays the login box.
Longer term fix:
Set the User account to auto login (Not recommended for secure systems.) and run a script to display the screen on the monitor.
Auto Login For Window 7 (and Windows Vista)
- Go to start 
 - Type netplwiz in the search box 
 - Select the user from which you want to login automatically and uncheck the box “Users must enter a username and password to use this computer”. 
 - Enter the password of the account in the box. 
 - Click ok 
 
Setup the display script 
- Just open notepad and save this code as a .bat file in the startup folder found in the start-menu:
displayswitch /extend
displayswitch /internal
 - Start menu location:
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup 
Links: http://forum.eeeuser.com/viewtopic.php?id=58307