Few days before, I have upgraded my OS from 12.04 to Ubuntu 14.04 64-bit (I had the same problem on 13.10). Ever since that, when I try to boot my notebook with any USB cable connected to USB 3.0 port, the screen just remains black and nothing happens and I have to reboot my notebook by force(holding power button). With no cable connected, Ubuntu loads just fine and connecting anything to USB 3.0 is not an issue anymore.
I guess, that it freezes before the kernel is loaded, because when I tried to reboot the computer using alt + screen + b, nothing happened.I was experiencing these difficulties even on the previous version, but just sometimes. I am running DELL Vostro 3750.
Please, does anyone have any idea, what may be causing this?
Edit: Maybe I should have also included note, that it freezes after I choose in grub boot menu, what should be booted. But not promptly after I select it. For about 5 seconds computer seems to be doing something (disk control is blinking).
EDIT: As requested, I am posting output from sudo blkid:
/dev/sda1: UUID="499931f2-2f83-4353-8160-9a48a5ee1878" TYPE="ext4" /dev/sda5: UUID="f0ad1205-6b52-4990-bb7b-543d53d969c5" TYPE="swap" /dev/sdb1: LABEL="RezervovM-CM-!no systM-CM-)mem" UUID="E03EB4FA3EB4CAB4" TYPE="ntfs" /dev/sdb2: UUID="EE2AC63D2AC60317" TYPE="ntfs" /dev/sdb4: LABEL="Data" UUID="8CC631C4C631AEF8" TYPE="ntfs" /dev/sdb5: UUID="babe1371-f48f-4b95-a93a-360bcec268b3" TYPE="ext4"
and my grub.cfg is avalible here: http://sharetext.org/Vvob