“signal out of range” problem after Ubuntu 11.04 Natty Installed

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http://ubuntuguide.net – Ubuntu 11.04 final has released and I just installed it from Windows 7 and previous Ubuntu 10.10 was erased. After installation, monitor displayed “signal out of range” while starting up, but I can choose Ubuntu or Windows 7 using up/down arrow keys and press enter to boot up although I can’t even see the grub menu. After grub, it boot into the system I selected and monitor worked again. In other words, while my computer starting to grub the monitor displayed “signal out of range” and I can’t see anything else, then it works again when Ubuntu/Windows splash (HowTos)