Had you updated your system that you can remember prior to this problem occurring? If you were to boot 14.04 live media, does the problem exist there? If you have Windows or another distro installed, does the problem occur there?
Had you updated your system that you can remember prior to this problem occurring? If you were to boot 14.04 live media, does the problem exist there? If you have Windows or another distro installed, does the problem occur there?