Question: I install Microsoft Windows OS in GPT mode and Ubuntu in MBR mode with two different HDD, and I cannot boot into Microsoft Windows OS, how to solve that?(6/1/2011) Answer: Please install OS both in GPT or MBR mode.
Both in GPT mode, please refer below steps:
1. Boot into BIOS→[Boot]→[PCI ROM Priority]→choose [EFI Compatible ROM], then press "F10" to save changes and exit.
2. Then press "F11" when booting up and choose "UEFI:[your ODD name]" to install OS.
Both in MBR mode, please refer below step:
Please press "F11" when booting up and choose "AHCI/SATA:[your ODD name]" to install OS.