I have Vista Home Premium and during bootup everything is normal, windows loading appears and then just before the windows icon screen my display says "No Signal" and goes to power saving mode. I know that windows is working as it makes the normal sounds for the login screen. I can only access windows using the VGA standard drivers. I have uninstalled all nvidia drivers, phsyx drivers, used driver sweeper and ccleaner. Then I boot back to windows with VGA mode and install different nvidia drivers, reboot and the same error occurs. I have also removed my gfx card and reseated it. I have also updated the bios for my motherboard and my graphics card to try and resolve the problem. The only change to my system before this issue was adding a 3rd HDD, which is working fine.