On 01/06/2017 09:57 AM, h...@hanswkraus.com wrote: > > Am 06.01.2017 15:45, schrieb Dan Ritter: > >> On Fri, Jan 06, 2017 at 03:32:01PM +0100, h...@hanswkraus.com >> <mailto:h...@hanswkraus.com> wrote: >>> Hi, >>> >>> urgent help needed. After adding an iptable entry for masquerading my >>> local network and making it permanent with >>> the package "iptables-persistent" my Debian server doesn't boot any >>> more. >>> It hangs with the line: >>> A start job is running for LSB: Raise network interfaces. ( ... /no >>> limit) >>> The root file system where it boots from is on an Adaptec HW Raid >>> interface, the motherboard is a Asrock. >>> >>> I habe tried to boot from a live CD (by pressing F11 as the short boot >>> msg of the motherboard suggests), but with no avail, >>> the boot menue doesn't appear. I don't see the Grub menue, the screen is >>> momentarily blank. >>> The computer insists on booting from the Adaptec. >>> >>> Is there any chance to interrupt the booting process? The other command >>> windows (Alt-F2 .. Alt-F6) show only the line >>> A start job is running for LSB: Raise network interfaces. ( ... /no >>> limit) >> >> When you boot normally, do you get a GRUB menu flashing by? If >> so, you can interrupt it there (try down-arrow) and edit the >> boot line to change the init system to init=/bin/sh >> >> Then you can mount your root filesystem r/w >> mount -o remount,rw / >> and edit your iptables troubles away. >> >> -dsr- >> > Hi Dan, > > tanks for the help but I don't see a GRUB menu. Maybe it's there because I get > an info > from the screen: frequency out of range... After a dew seconds the system > beeps once > and continues booting. >
This is where your initial problem is. Apparently your monitor can't sync to the resolution your system is using during boot. If you can try another monitor that might have a better sync range. Maybe try to jump into the bios setup and see if there are any options that would affect the video resolution like setting a generic VGA mode. I've had this happen but I have been able to ssh into the machine after it boots to try different grub options. > > Kind regards, > Hans > > *...Bob*
