cannot boot cdrom svn real/qemu

Hallo,

I have found a problem.
SVN-version cannot boot from cdrom on real HW and Qemu (?!),
but on 1 of 2 systems only.
ros-3.11  works on 2 of 2 systems (real,qemu)
s. details

Whats going wrong?
maybe a conflict with any HW.

Heiko


details:

- test real HW (*1)

1. boot cd
   ReactOS Setup
   load .... ext2.sys
    -> hang! screen: black


Version: 47265, 47751

*1
$ lspci | egrep "Host|VGA|Ether"
00:00.0 Host bridge: Intel Corporation 82845 845 [Brookdale] Chipset Host Bridge (rev 03)
02:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA 1064SG [Mystique] (rev 02)
02:04.0 Ethernet controller: 3Com Corporation 3c905 100BaseTX [Boomerang]

# fdisk -l
   Device Boot      Start         End      Blocks   Id  System
   /dev/sda1               1         256     2056288+  a9  NetBSD
   /dev/sda2             257         768     4112640   83  Linux
   /dev/sda3   *         769        1792     8225280    b  W95 FAT32
   /dev/sda4            1793        4865    24683872+   5  Extended
   /dev/sda5            1793        1825      265041   82  Linux swap / Solaris
   /dev/sda6            1826        2849     8225248+  83  Linux
   /dev/sda7            2850        4865    16193488+  a9  NetBSD


- table summary
  num     system  ver     real/VM result
  1       1       svn     real    Error
  2       1       svn     qemu    Error
  3       2       svn     qemu    ok.
  4       1       3.11    real    ok.
  5       2       svn     real    ok.

svn: 47265, 47751
1,2: tested with: Safe Mode, Enable Boot Logging, Enable VGA Mode, Debugging Mode
     -> no errors was printed
2,3: qemu -hda ros-svn.hda.img -cdrom /dev/cdrom -boot d
     qemu -hda ros-svn.hda.img -cdrom bootcd-47265-dbg.iso -boot d

btwn:
- 1. ReactOS Setup: menu_timeout=0.001 s (to small to read)
- 2. ReactOS Setup:  F8 works at time, or not (undetermined)

:x