Ok, I turned off all power options in the BIOS.
Indeed it seemed to be the DOM: today the system froze again, and now it won't even boot beyond the "loading" screen.
So I unplugged the DOM and took an external USB drive and installed the software on that without any issue.
Unfortunately, after finishing the install and rebooting, it hangs on "loading" again, so I tried booting the old DOM in v6, but to no avail...
I had the RAID array checked during the night: zero errors.
But still: no DSS version is loading succesfully now.
So I took out all hardware and rebooted, et voila: it ran again.
I plugged all hardware in, changed the slots of the NICs to avoid any IRQ errors and booted succesfully again.
Apparently moving the NIC was helpful.
After that, I cleared the TDB Database and reconnected to the DC and got it running.
However, I faced once that the machine hang during booting (just after "init runlevel 2"), so I'll order a new DOM just to be sure...
Last edited by Arcesilaus; 10-02-2012 at 10:43 AM.
Reason: update