Did you checked BIOS settings?
On the Info tab, what MB model you have? What BIOS version you have?
Did you detached the other disks before installing Win 7?
Did you installed as UEFI or Legacy?
This is how I would install (as UEFI)
Detach
ALL other disks, leaving on only the disk you want to install on.
On BIOS
Set SATA=AHCI
Disable fast boot (you can enable it after installation)
You have to use a Win 7 64 bits installation disk. Win 7 32 bits isn't compatible with UEFI
Disable secure boot
OS type Windows UEFI = Secure boot, so if OS type =
Other, secure boot is disabled.
for CSM, here are the settings (in bold)
Launch CSM.......................................(Auto,
Enabled, Disabled)
Boot Device Control.............................(UEFI and Legacy OPROM, Legacy OPROM only,
UEFI Only)
Boot from Network Devices...................(
Ignore, Legacy Only)
Boot from Storage Devices....................(Ignore, Legacy Only,
UEFI Driver first)
Boot from PCIe/PCI Expansion Devices....(Legacy Only,
UEFI driver first)
Boot from the Win 7 installation disk
ON UEFI MODE (important). If you are using a USB flash disk, make sure it has the \efi\boot folder or it wont boot as UEFI.
During POST, launch the Boot menu (F12?). There will be 2 options Legacy and UEFI. Choose CD/DVD UEFI or USB UEFI.
Go to Install - advanced - delete all partitions - Create new - Win 7 will create 3 partitions
- 100 M Fat 32 - UEFI
- 120 M RAW - MSR
- a large NTFS
Install on the large NTFS
For the updates
MS releases SP2 for Windows 7