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I have a weird problem lately:

My system only boots if either a CD is inserted (any CD, not a specific CD(*)) or if I enter UEFI-BIOS before boot.

Otherwise, grub2 would start but afterwards the screen stays black.

The last thing I did before this problem occured (at least I think this was the last thing) was adding partitions on /dev/sdb and /dev/sdc, generating a raid-1 out of these two partitions and adding the RAID to /etc/mdadm/mdadm.conf and /etc/fstab.

My boot-device however is /dev/sda (I have a EFI-partition on /dev/sda1)

If that helps: I run Debian Wheezy (but also have some packages from experimental).

How can I locate the error and solve it?

(*) I tried the following CDs:

  1. A Debian Wheezy Live DVD (actually a DVD, not a CD) => System booted
  2. A Mini CD which came with my WiFi-Router (so to say a driver CD) => System booted
  3. Another driver CD that came with my printer ages ago => System booted
  4. A music CD (Vive la Fête - République Populaire, but I'm quite convinced that doesn't matter) => System didn't boot

It looks like all data CDs work...

[edit]

here's my dmesg file (with inserted CD)
http://pastebin.com/cxvv0Hqe
maybe that helps!?

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What is "any CD"? Even a music CD, only a bootable CD, CDs with data? – vonbrand Feb 11 at 1:58
Thank you @vonbrand! I updated my question. – Marcel Feb 11 at 9:07
After power on, do you have an option F12 Boot Menu (or another F-Key)? Does it boot from that menu? – ott-- Feb 11 at 12:13
@ott-- no, I can press DEL or some F-button (I think it is F12), which both brings me to the first page of UEFI-BIOS, where I can choose the boot order (but I'm not exactly sure, I will have a look when I'm home again). – Marcel Feb 11 at 12:32
added a pastebin of dmesg – Marcel Feb 11 at 18:35
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1 Answer

up vote 0 down vote accepted

I have "solved"??? the problem.

Well I don't really have a solution, as I couldn't identify the reason for the problem. However, the last 2 boots went well without a CD inserted and without entering the BIOS.

What I did was the following:

  1. I installed the package firmware-realtek as dmesg -T -l err,crit,alert,emerg showed me that the realtek firmware was missing.

  2. I updated my system with

    aptitude update
    aptitude upgrade
    aptitude dist-upgrade

Now it seems like the problem is gone...

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