On Wed, April 11, 2018 1:17 pm, berto00000...@gmail.com wrote:
> On Wednesday, April 11, 2018 at 7:05:04 PM UTC+7, 97a6sd67fs9 wrote:
>> In order not to ruin my 3.2 production installation I bought a new NVME
>> SSD. After disk replacement I installed Qubes 4.0 and test my needs.
>> Then I put the old SSD back in and now my PC doesn't start anymore. It
>> hangs on the boot menu screen (Lenovo T460s) and when I enter into
>> "Qubes" or the SSD device, it only refresh the screen.
> Have you connected any other storage devices to your machine? That might
> mess up the the device names if the configs don't use the device UUIDs.

I think it's related to this. My guess is, when you installed 4.0, it
overwrote the boot menu entry in your EFI firmware, so now it doesn't work
for 3.2. If you were using legacy mode boot for 3.2, try to set that first
in your boot order. If EFI mode, you might have to boot into Qubes
recovery mode (possibly from the 3.2 DVD), then repair the EFI boot entry.
The command will be something like:

sudo efibootmgr -c -L Qubes32 -d /dev/sda -p 1 -l \\EFI\\qubes\\xen.efi

Note the "/dev/sda" and "-p 1" might vary. "-p 1" is the partition number
for your EFI partition (and this is what might have changed with your 4.0

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