Just to confirm.
Have you tried the Monitor on another PC?
Have you changed the DVI cable?
Have you got a graphics card you can put in the PC to test?
have you tried plugging the monitor in before power on the server?
as for the 2 beeps
Source: ftp://ftp.software.ibm.com/systems/support/system_x/06p1796.pdf page 85
Two Short Beeps (Information only,
the configuration has changed)
1. Run Diagnostics
2. Run Configuration/Setup