I have had the exact same problem. :-[
I thought it was because i messed with compiz.
I am reinstalling my LL, as i didn't have anything on my harddisk other then some tweaks.
The live DVD works fine, and a first reboot is fine too.
Just one question, did you also de-install flash??
Because as far as i can remember thats the last tweak i did before my machine went black.
I was able to remotely login via SSH, and found that if i did:
$ sudo stop lightdm
and then
$ sudo startxcfe4
the desktop would show, but as its was done bij sudo, i was logged in as root.
I tried some settings but when rebooting the machine would still not work.
So i now decided to reinstall, did a memory test but no problems where found.
Im gonna watch this closely.
---Edit---
Update:
So i have run install updates, and it still works, i have disabled the light locker, (Unchecked) Switched off Enable light-locker in light locker settings.
I'm installing weatherplugin and the games pack and the optional-extra's.
I'll update soon.
Update:
As expected it still works after the installation of the software and adding weather plugin to my pannel.
Im gonna install a bunch of apps and not use Conky for now and see what happens. I'll leave flash alone for now too. Update soon.
Update:
I have removed flash, and it still works. (Just like on my virtualbox instance on my mac)
I have installed shiki color (themes) and they work.
Installed gufw, and SSH.
I'm glade it works but a bit worried i haven't found the problem yet.
I'll install some more software like clamav, conky i'll save for last.
Maybe i should figure out how to backup this stuff. Like in a ISO or something that will just overwrite my data when ever this problem reoccurs.
So unfortunately i wasn't able to figure out what exactly caused this to happen.
====!!FOUND IT!!====
After installing clamav the system went black again.
It seems the problem is with clamav, which is not what i expected.
Later on night i'll try and remove it via ssh or command line, if i can figure out a way to get to it.
ctl-alt-F1 shout do the trick i read somewhere.
==Solution==
So i removed clam, but that didn't do the trick.
sudo apt-get --purge remove clamav clamav-base clamav-freshclam libclamav6
I rebooted after that but it didn't solve it.
So i pressed ctrl-alt-F1
Logged in with my username and password, and then did the following:
sudo stop lightdm
then did: (notice without sudo!)
startxfce4
That made it run again!
I did a reboot not doing anything else. Had to enter my password to be able to do that....
And after this reboot it just worked again, all of it.
So next time you have a black screen try:
ctlr-alt-F1
login using your username & password.
do:
sudo stop lightdm
startxfce4
After the desktop runs, reboot. (enter password if needed)
And then it should work for you again too.
I thought it was because i messed with compiz.
I am reinstalling my LL, as i didn't have anything on my harddisk other then some tweaks.
The live DVD works fine, and a first reboot is fine too.
Just one question, did you also de-install flash??
Because as far as i can remember thats the last tweak i did before my machine went black.
I was able to remotely login via SSH, and found that if i did:
$ sudo stop lightdm
and then
$ sudo startxcfe4
the desktop would show, but as its was done bij sudo, i was logged in as root.
I tried some settings but when rebooting the machine would still not work.
So i now decided to reinstall, did a memory test but no problems where found.
Im gonna watch this closely.
---Edit---
Update:
So i have run install updates, and it still works, i have disabled the light locker, (Unchecked) Switched off Enable light-locker in light locker settings.
I'm installing weatherplugin and the games pack and the optional-extra's.
I'll update soon.
Update:
As expected it still works after the installation of the software and adding weather plugin to my pannel.
Im gonna install a bunch of apps and not use Conky for now and see what happens. I'll leave flash alone for now too. Update soon.
Update:
I have removed flash, and it still works. (Just like on my virtualbox instance on my mac)
I have installed shiki color (themes) and they work.
Installed gufw, and SSH.
I'm glade it works but a bit worried i haven't found the problem yet.
I'll install some more software like clamav, conky i'll save for last.
Maybe i should figure out how to backup this stuff. Like in a ISO or something that will just overwrite my data when ever this problem reoccurs.
So unfortunately i wasn't able to figure out what exactly caused this to happen.
====!!FOUND IT!!====
After installing clamav the system went black again.
It seems the problem is with clamav, which is not what i expected.
Later on night i'll try and remove it via ssh or command line, if i can figure out a way to get to it.
ctl-alt-F1 shout do the trick i read somewhere.
==Solution==
So i removed clam, but that didn't do the trick.
sudo apt-get --purge remove clamav clamav-base clamav-freshclam libclamav6
I rebooted after that but it didn't solve it.
So i pressed ctrl-alt-F1
Logged in with my username and password, and then did the following:
sudo stop lightdm
then did: (notice without sudo!)
startxfce4
That made it run again!
I did a reboot not doing anything else. Had to enter my password to be able to do that....
And after this reboot it just worked again, all of it.
So next time you have a black screen try:
ctlr-alt-F1
login using your username & password.
do:
sudo stop lightdm
startxfce4
After the desktop runs, reboot. (enter password if needed)
And then it should work for you again too.