Lenovo T420

[jhooks320]

What do you mean "drive selection screen"? Sounds like a bootloader to me...



Correct.

The bios screen where I choose what drive to load. The "F12" temporary boot device screen. Sorry if I am not explaining it correctly. The screen I originally used to select the install USB.

 

[RehabMan]

The bios screen where I choose what drive to load. The "F12" temporary boot device screen. Sorry if I am not explaining it correctly. The screen I originally used to select the install USB.

What happens if you let your computer boot normally via the HDD?

Assuming you installed a bootloader to your HDD...

 

[jhooks320]

What happens if you let your computer boot normally via the HDD?

Assuming you installed a bootloader to your HDD...

When I turn the laptop on, it goes straight to the "F12" screen as if there is no bootloader installed on the drive. It is set in bios to boot to the sata drive. And there is only one hard drive. I even downloaded multibeast and installed the bootloader and still it for some reason will not boot.

 

[RehabMan]

When I turn the laptop on, it goes straight to the "F12" screen as if there is no bootloader installed on the drive. It is set in bios to boot to the sata drive. And there is only one hard drive. I even downloaded multibeast and installed the bootloader and still it for some reason will not boot.

You should probably check your boot records:

Dump all the boot records and check for active partition:

sudo dd if=/dev/rdisk0 of=/tmp/mbr count=1 bs=512
xxd</tmp/mbr|tail
sudo dd if=/dev/rdisk0s2 of=/tmp/pbr count=1 bs=512
xxd</tmp/pbr|tail
sudo dd if=/dev/rdisk0s2 of=/tmp/pbr count=2 bs=512
xxd</tmp/pbr|tail
# all of above should end in 55aa
sudo fdisk /dev/rdisk0
# mac partition should be marked with '*'

 

[jhooks320]

You should probably check your boot records:

Dump all the boot records and check for active partition:

sudo dd if=/dev/rdisk0 of=/tmp/mbr count=1 bs=512
xxd</tmp/mbr|tail
sudo dd if=/dev/rdisk0s2 of=/tmp/pbr count=1 bs=512
xxd</tmp/pbr|tail
sudo dd if=/dev/rdisk0s2 of=/tmp/pbr count=2 bs=512
xxd</tmp/pbr|tail
# all of above should end in 55aa
sudo fdisk /dev/rdisk0
# mac partition should be marked with '*'

I will try this and post the results when I get home. Thank you for the help!!