WebUI not working

Hello,
My web ui stopped working after I tried manually running smart test for system disk. Web browser hang up, refreshed and showed just blank page.
I have tried restarted nginx and php but that didnt helped. After a while I rebooted NAS and now there is only blue page with logo, but login window is not showing up. Everything else appears to be running normally

I cannot find anything relevant in logs anywhere except access log and there are no JS errors on browser side. Any idea what could have caused this?

root@nc-nas1:~# uname -a
Linux nc-nas1 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux

root@nc-nas1:~# dpkg -l|grep openmediavault
ii openmediavault 1.0.9 all Open network attached storage solution
ii openmediavault-keyring 0.3 all GnuPG archive keys of the OpenMediaVault archive
ii openmediavault-lvm2 1.0 all OpenMediaVault Logical Volume Manager (LVM2) plugin
ii openmediavault-netatalk 1.1 all OpenMediaVault netatalk (AppleTalk Protocol Suite) plugin
ii openmediavault-omvextrasorg 1.0.3 all OMV-Extras.org Package Repositories for OpenMediaVault
ii openmediavault-usbbackup 1.0 all OpenMediaVault USB/eSATA backup plugin

Erasing packages didnt do anything.

root@nc-nas1:/var/log# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 36G 1.2G 33G 4% /
udev 10M 0 10M 0% /dev
tmpfs 384M 780K 383M 1% /run
/dev/disk/by-uuid/672cfec1-c2f0-44cf-85e8-1ea130652868 36G 1.2G 33G 4% /
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 1.1G 0 1.1G 0% /run/shm
tmpfs 1.9G 0 1.9G 0% /tmp
/dev/mapper/vg_backup-lv_backup 885G 562G 324G 64% /media/7ffbeef3-2448-4723-9552-7fc78027e6ab
/dev/mapper/vg_backup-lv_install 96G 19G 78G 19% /media/1520f1ee-359c-4dc8-b860-89b3b7bc6144
/dev/mapper/vg_backup-lv_tm_robert 190G 188M 190G 1% /media/d607e9f4-57e6-410d-9eed-cd15137e359a
/dev/mapper/vg_backup-lv_tm_shii 99G 15G 84G 16% /media/f3558796-b6d2-4141-95c3-43aa72c907b1
/dev/mapper/vg_dp-lv_omniback 928G 271G 657G 30% /media/e71628fd-3436-4276-bb09-7d0a5d452336
/dev/mapper/vg_dp-lv_omniback_bcrs 7.0G 3.0G 4.0G 43% /media/ec790aef-fa09-455b-83f0-5c6b4cb2d90d
/dev/mapper/vg_dp-lv_templates 97G 33G 65G 34% /media/dd1ad8c7-b781-43aa-b6d0-ae6faa1d9aa2
/dev/mapper/vg_backup-lv_owncloud 46G 189M 46G 1% /media/088183f6-98d1-44f0-a84d-e0aa70421be4
/dev/mapper/vg_dp-lv_omniback 928G 271G 657G 30% /export/omniback
/dev/mapper/vg_dp-lv_omniback_bcrs 7.0G 3.0G 4.0G 43% /export/omnibackbcrs
/dev/mapper/vg_backup-lv_install 96G 19G 78G 19% /export/install
/dev/mapper/vg_dp-lv_templates 97G 33G 65G 34% /export/templates

Its Intel 320 40GB

that fixed it, thank you for your help

its brand new SSD, I just bought it 3 days ago for this nas.

EDIT:
fixed by monit part, I have removed apache already earlier