Need help with Boot sector verification

I have a problem with Vista startup and all attempts with bootrec and
bootsect failed. Startup repair detects C: drive and detects Vista Ultimate.
Repair says it did not find any problem. When starting up machine I get
black screen without any error message. Issue seems to be similar to cloning
hard drive as I found on the net. If I rename bootmgr I don't get any error
message so it looks like MBR doesn't even transfer control to boot sector.
Disk signature seems to be fine and matches the one I found in registry in
HKLM\SYSTEM\MountedDevices.
I don't seem to be able to find when on the disk I can find GUID which is in
BCD. When I write boot sector by bootsect /nt60 C: it generate GUID which
doesn't match to one generated by bootrec /rebuildbcd.

Do I have to update GUID manually in BCD to match the one generated for
volume by "bootsect /nt60 C: " ?

Now I'm trying to verify boot partition. I dumped first 26kB of data from
boot sector of partition 1 (C: drive) and I'm trying to compare it to copy
of the sector in "Unallocated" space. From those hundred pages of data I can
see only following differences:


Partition 1:
=========
0x00100000 EB 63 90 4E 54 46 53 20 : 20 20 20 00 02 08 00 00 .c.NTFS
......
0x00100010 00 00 00 00 00 F8 00 00 : 3F 00 FF 00 00 08 00 00
.........?.......
0x00100020 00 00 00 00 80 00 80 00 : E8 C7 55 0F 00 00 00 00
...........U.....
0x00100030 00 00 0C 00 00 00 00 00 : 7F 18 2A 01 00 00 00 00
...........*.....
0x00100040 F6 00 00 00 01 00 00 00 : F6 BF 30 FA E8 30 FA 9C
...........0..0..

0x001024A0 AE A9 B1 23 08 01 00 00 : A0 04 00 00 00 00 00 00
....#............

0x001024F0 01 01 00 00 00 00 00 05 : 12 00 00 00 80 FA FF FF
.................
0x00102500 63 00 6B 00 01 01 00 00 : 00 00 00 05 12 00 00 00
c.k.............


Unallocated space:
================
0x1EABA00000 EB 52 90 4E 54 46 53 20 : 20 20 20 00 02 08 00 00 .R.NTFS
......
0x1EABA00010 00 00 00 00 00 F8 00 00 : 3F 00 FF 00 00 D0 55 0F
.........?.....U. Shouldn't I replace D0 55 0F by 08 00 00
(start of the partition C: ?
0x1EABA00020 00 00 00 00 80 00 80 00 : FF BF 4B 03 00 00 00 00
...........K.....
0x1EABA00030 00 00 0C 00 00 00 00 00 : FF BB 34 00 00 00 00 00
...........4.....
0x1EABA00040 F6 00 00 00 01 00 00 00 : F8 AE 20 86 F3 20 86 3C ..........
... .<

0x1EABA024A0 8E B5 59 5A 08 01 00 00 : A0 04 00 00 00 00 00 00
...YZ............

0x1EABA024F0 01 01 00 00 00 00 00 05 : 12 00 00 00 39 36 44 39
.............96D9
0x1EABA02500 44 30 41 39 01 01 00 00 : 00 00 00 05 12 00 00 00
D0A9............


Why do I see these differences? Should they match to the last byte? Is there
any detailed description of boot sector for Vista?