On 12/12/2007, at 8:38 PM, Ioan Nemes wrote:

quoted text
> Greetings,
>
> Try to install OpenBSD 4.2 i386 on a new HP Compaq dc7700 Small  
> Form Factor,
> but when it comes to install the software sets from the CD, the  
> install
> fails:
[cut]
quoted text
> Which one contains the install media? (or `done`) [cd0]
>
> ---------------------------------------------------------------------- 
> -------
> --
> it stops here, blanks out!
> ---------------------------------------------------------------------- 
> -------
> --
>
> During boot the cd0 works OK (is seems), and it is recognized as:
>
> cd0 at scsibus0 targ0 lun0: <TSSTcorp, CDW/DWD TS-H493A, CD067  
> SCSI0 5/cdrom
> removable
> cd0(pciide0:1:0) using PIO mode 4, Ultra DMA mode 5
>
>
[cut]

Have you eliminated the obvious?  For example ...

Does the CD work on other machines - can you install OpenBSD off the  
same CD?
Does the machine work with other CDs (Linux, Windows, whatever?)
Can you get another OpenBSD CD to try?

There is the really-old-machine issue recently on misc@ - I've had  
something similar with a scratched CD (but get errors rather than  
blank output.)