I have an HP Z400 workstation (Windows) with an NVIDIA NVS295. When I turn on the PC, everything looks to be turned on (hard disk, VGA, processor...), but after a few seconds the PC makes one short beep, and after a bit less than 1 minute it makes a second and identical beep. After that nothing happens and meanwhile the monitor has always stayed black.
Between the first and second beep I can also hear the hard disk starting to turn and making noise.
The monitor somehow recognizes that something is connected because I don't get the error from the monitor "no input connected", but it also doesn't show any image at all.
I also tried to use both the DP port of the NVIDIA NVS295, I tried to disconnect the hard disks, I also tried to change the PCI slot of the NVS295 on the motherboard. All of those trials did not bring to any different outcome.
Any ideas?
The monitor of course works! I use it everyday with my laptop. The workstation is an old one, I haven't turned it on for many months, but it's supposed to work.