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I tried booting my PC this morning and everything looked much bigger (e.g. the boot menu) than usually. The XServer failed to start (as the below output states):

X.Org X Server 1.15.1
Release Date: 2014-04-13
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.2.0-37-generic x86_64 Ubuntu
Current Operating System: Linux radogost 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=e4f83085-428d-4a31-9110-62c15c2f7434 ro quiet splash
Build Date: 16 April 2014  01:36:29PM
xorg-server 2:1.15.1-0ubuntu2 (For technical support please see http://www.ubuntu.com/support) 
Current version of pixman: 0.30.2
    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Mon May 26 10:44:45 2014
(==) Using config file: "/etc/X11/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
Initializing built-in extension Generic Event Extension
Initializing built-in extension SHAPE
Initializing built-in extension MIT-SHM
Initializing built-in extension XInputExtension
Initializing built-in extension XTEST
Initializing built-in extension BIG-REQUESTS
Initializing built-in extension SYNC
Initializing built-in extension XKEYBOARD
Initializing built-in extension XC-MISC
Initializing built-in extension SECURITY
Initializing built-in extension XINERAMA
Initializing built-in extension XFIXES
Initializing built-in extension RENDER
Initializing built-in extension RANDR
Initializing built-in extension COMPOSITE
Initializing built-in extension DAMAGE
Initializing built-in extension MIT-SCREEN-SAVER
Initializing built-in extension DOUBLE-BUFFER
Initializing built-in extension RECORD
Initializing built-in extension DPMS
Initializing built-in extension Present
Initializing built-in extension DRI3
Initializing built-in extension X-Resource
Initializing built-in extension XVideo
Initializing built-in extension XVideo-MotionCompensation
Initializing built-in extension SELinux
Initializing built-in extension XFree86-VidModeExtension
Initializing built-in extension XFree86-DGA
Initializing built-in extension XFree86-DRI
Initializing built-in extension DRI2
Loading extension GLX
(EE) 
Fatal server error:
(EE) no screens found(EE) 
(EE) 
Please consult the The X.Org Foundation support 
     at http://wiki.x.org
 for help. 
(EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
(EE) 
(EE) Server terminated with error (1). Closing log file.
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error

Also, the output of /var/log/Xorg.0.log shows:

[    48.626] 
X.Org X Server 1.15.1
Release Date: 2014-04-13
[    48.626] X Protocol Version 11, Revision 0
[    48.627] Build Operating System: Linux 3.2.0-37-generic x86_64 Ubuntu
[    48.627] Current Operating System: Linux radogost 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64
[    48.627] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=e4f83085-428d-4a31-9110-62c15c2f7434 ro quiet splash
[    48.627] Build Date: 16 April 2014  01:36:29PM
[    48.627] xorg-server 2:1.15.1-0ubuntu2 (For technical support please see http://www.ubuntu.com/support) 
[    48.627] Current version of pixman: 0.30.2
[    48.628]    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
[    48.628] Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    48.629] (==) Log file: "/var/log/Xorg.0.log", Time: Mon May 26 10:03:43 2014
[    48.629] (==) Using config file: "/etc/X11/xorg.conf"
[    48.630] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    48.630] (==) ServerLayout "Layout0"
[    48.630] (**) |-->Screen "Screen0" (0)
[    48.630] (**) |   |-->Monitor "Monitor0"
[    48.630] (**) |   |-->Device "Device0"
[    48.630] (**) |-->Input Device "Keyboard0"
[    48.630] (**) |-->Input Device "Mouse0"
[    48.630] (==) Automatically adding devices
[    48.630] (==) Automatically enabling devices
[    48.630] (==) Automatically adding GPU devices
[    48.630] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[    48.630]    Entry deleted from font path.
[    48.630] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[    48.630]    Entry deleted from font path.
[    48.630] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[    48.630]    Entry deleted from font path.
[    48.630] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[    48.630]    Entry deleted from font path.
[    48.630] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[    48.630]    Entry deleted from font path.
[    48.630] (==) FontPath set to:
    /usr/share/fonts/X11/misc,
    /usr/share/fonts/X11/Type1,
    built-ins
[    48.630] (==) ModulePath set to "/usr/lib/x86_64-linux-gnu/xorg/extra-modules,/usr/lib/xorg/extra-modules,/usr/lib/xorg/modules"
[    48.630] (WW) Hotplugging is on, devices using drivers 'kbd', 'mouse' or 'vmmouse' will be disabled.
[    48.630] (WW) Disabling Keyboard0
[    48.630] (WW) Disabling Mouse0
[    48.630] (II) Loader magic: 0x7f7154eb2d60
[    48.630] (II) Module ABI versions:
[    48.630]    X.Org ANSI C Emulation: 0.4
[    48.630]    X.Org Video Driver: 15.0
[    48.630]    X.Org XInput driver : 20.0
[    48.630]    X.Org Server Extension : 8.0
[    48.631] (--) PCI:*(0:1:0:0) 10de:1180:1043:83f0 rev 161, Mem @ 0xfa000000/16777216, 0xf0000000/134217728, 0xf8000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/524288
[    48.631] Initializing built-in extension Generic Event Extension
[    48.632] Initializing built-in extension SHAPE
[    48.632] Initializing built-in extension MIT-SHM
[    48.632] Initializing built-in extension XInputExtension
[    48.632] Initializing built-in extension XTEST
[    48.632] Initializing built-in extension BIG-REQUESTS
[    48.632] Initializing built-in extension SYNC
[    48.632] Initializing built-in extension XKEYBOARD
[    48.633] Initializing built-in extension XC-MISC
[    48.633] Initializing built-in extension SECURITY
[    48.633] Initializing built-in extension XINERAMA
[    48.633] Initializing built-in extension XFIXES
[    48.633] Initializing built-in extension RENDER
[    48.633] Initializing built-in extension RANDR
[    48.633] Initializing built-in extension COMPOSITE
[    48.633] Initializing built-in extension DAMAGE
[    48.634] Initializing built-in extension MIT-SCREEN-SAVER
[    48.634] Initializing built-in extension DOUBLE-BUFFER
[    48.634] Initializing built-in extension RECORD
[    48.634] Initializing built-in extension DPMS
[    48.634] Initializing built-in extension Present
[    48.634] Initializing built-in extension DRI3
[    48.634] Initializing built-in extension X-Resource
[    48.635] Initializing built-in extension XVideo
[    48.635] Initializing built-in extension XVideo-MotionCompensation
[    48.635] Initializing built-in extension SELinux
[    48.635] Initializing built-in extension XFree86-VidModeExtension
[    48.635] Initializing built-in extension XFree86-DGA
[    48.635] Initializing built-in extension XFree86-DRI
[    48.635] Initializing built-in extension DRI2
[    48.635] (WW) "glamoregl" will not be loaded unless you've specified it to be loaded elsewhere.
[    48.635] (II) "glx" will be loaded by default.
[    48.635] (WW) "xmir" is not to be loaded by default. Skipping.
[    48.635] (II) LoadModule: "glx"
[    48.636] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/libglx.so
[    48.642] (II) Module glx: vendor="NVIDIA Corporation"
[    48.642]    compiled for 4.0.2, module version = 1.0.0
[    48.642]    Module class: X.Org Server Extension
[    48.642] (II) NVIDIA GLX Module  304.117  Tue Nov 26 21:45:09 PST 2013
[    48.642] Loading extension GLX
[    48.642] (II) LoadModule: "nvidia"
[    48.642] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so
[    48.642] (II) Module nvidia: vendor="NVIDIA Corporation"
[    48.642]    compiled for 4.0.2, module version = 1.0.0
[    48.642]    Module class: X.Org Video Driver
[    48.643] (II) NVIDIA dlloader X Driver  304.117  Tue Nov 26 21:27:08 PST 2013
[    48.643] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[    48.643] (--) using VT number 7

[    48.646] (II) Loading sub module "fb"
[    48.646] (II) LoadModule: "fb"
[    48.646] (II) Loading /usr/lib/xorg/modules/libfb.so
[    48.646] (II) Module fb: vendor="X.Org Foundation"
[    48.646]    compiled for 1.15.1, module version = 1.0.0
[    48.646]    ABI class: X.Org ANSI C Emulation, version 0.4
[    48.646] (II) Loading sub module "wfb"
[    48.646] (II) LoadModule: "wfb"
[    48.646] (II) Loading /usr/lib/xorg/modules/libwfb.so
[    48.646] (II) Module wfb: vendor="X.Org Foundation"
[    48.646]    compiled for 1.15.1, module version = 1.0.0
[    48.646]    ABI class: X.Org ANSI C Emulation, version 0.4
[    48.646] (II) Loading sub module "ramdac"
[    48.646] (II) LoadModule: "ramdac"
[    48.646] (II) Module "ramdac" already built-in
[    48.646] (**) NVIDIA(0): Depth 24, (--) framebuffer bpp 32
[    48.646] (==) NVIDIA(0): RGB weight 888
[    48.646] (==) NVIDIA(0): Default visual is TrueColor
[    48.646] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[    48.646] (**) NVIDIA(0): Enabling 2D acceleration
[    48.967] (II) NVIDIA(0): NVIDIA GPU GeForce GTX 680 (GK104) at PCI:1:0:0 (GPU-0)
[    48.967] (--) NVIDIA(0): Memory: 2097152 kBytes
[    48.967] (--) NVIDIA(0): VideoBIOS: 80.04.09.00.0f
[    48.967] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[    48.967] (--) NVIDIA(0): Interlaced video modes are supported on this GPU
[    48.970] (--) NVIDIA(0): Valid display device(s) on GeForce GTX 680 at PCI:1:0:0
[    48.970] (--) NVIDIA(0):     CRT-0
[    48.970] (--) NVIDIA(0):     DFP-0
[    48.970] (--) NVIDIA(0):     DFP-1
[    48.970] (--) NVIDIA(0):     DFP-2
[    48.970] (--) NVIDIA(0):     DFP-3
[    48.970] (--) NVIDIA(0):     DFP-4
[    48.970] (--) NVIDIA(0): CRT-0: 400.0 MHz maximum pixel clock
[    48.970] (--) NVIDIA(0): DFP-0: 330.0 MHz maximum pixel clock
[    48.970] (--) NVIDIA(0): DFP-0: Internal Single Link TMDS
[    48.970] (--) NVIDIA(0): DFP-1: 165.0 MHz maximum pixel clock
[    48.970] (--) NVIDIA(0): DFP-1: Internal Single Link TMDS
[    48.970] (--) NVIDIA(0): DFP-2: 165.0 MHz maximum pixel clock
[    48.970] (--) NVIDIA(0): DFP-2: Internal Single Link TMDS
[    48.970] (--) NVIDIA(0): DFP-3: 330.0 MHz maximum pixel clock
[    48.970] (--) NVIDIA(0): DFP-3: Internal Single Link TMDS
[    48.970] (--) NVIDIA(0): DFP-4: 960.0 MHz maximum pixel clock
[    48.970] (--) NVIDIA(0): DFP-4: Internal DisplayPort
[    48.971] (EE) NVIDIA(0): Failed to assign any connected display devices to X screen 0
[    49.002] (EE) NVIDIA(0): Failing initialization of X screen 0
[    49.167] (II) UnloadModule: "nvidia"
[    49.167] (II) UnloadSubModule: "wfb"
[    49.167] (II) UnloadSubModule: "fb"
[    49.167] (EE) Screen(s) found, but none have a usable configuration.
[    49.167] (EE) 
Fatal server error:
[    49.167] (EE) no screens found(EE) 
[    49.167] (EE) 
Please consult the The X.Org Foundation support 
     at http://wiki.x.org
 for help. 
[    49.167] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[    49.167] (EE) 
[    49.169] (EE) Server terminated with error (1).

Further, the GUI of my other OS doesn't work either. I would really appreciate it someone can advise me on what's the issue and how can I get it fixed.

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