Bootmanager does not start Vista

[Aristide de la Tanne]

On my PC I have XP and Vista as a dual boot. In Vista bootmanager, XP
is set as primary. I daily work on XP, but for some months I did not
use Vista. Today after I selected Vista to boot, nothing was happening
at all, black screen and no loading activities.

With VistBootPro on XP, I verified that the expected entries in BCD
are still there.
Then I booted from DVD, selectes Repair Computer, then “Diagnose Boot
problems”, but it returned that no problems could be detected. Now, I
am uncertain if I should apply Bootrec /FixMBR or /Fixboot or what to
do else. I don’t want to unintendedly disable the option to boot XP.

 

[Aristide de la Tanne]

after I selected Vista to boot, nothing was happening at all.
black screen and no loading activities.

Then I booted from DVD, selectes Repair Computer, then “Startup Repair”,
but it returned that no problems could be detected.

Today I executed bootrec /FixMbr, but it did not help.

Then I executed bootrec /FixBoot, but it returned: "This volume does
not contain a recognized file system. Please make sure that all
required file system drivers ..."

bootrec /ScanOs returned: "total identified windows installations: 0"
Though before, after selecting "Repair your Computer", the System
Recovery Options had said that there was Windows Vista Ultimate on
partition H (as supposed to be).

Then I made a system restore to a recent restore point. It ran
successfully and thereby proved the existence of a Vista installation.
But as expected, it did not overcome the boot problem, which seems to
be caused somehow by partitioning and file system.

Any ideas what elso to try?