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Few days before, I have upgraded my OS from 12.04 to ubuntu 12.10 (quantal) 64-bit. Ever since that, when I try to boot my notebook with any cable connected to it, 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 than I can connect everything and there is no problem.

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, and having also installed windows 7 next to ubuntu.

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).

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have you checked the boot priorities/sequence? –  VRU Feb 2 '13 at 9:47
    
No, I have not. Where I can do that? And what am I looking for? –  Jendas Feb 2 '13 at 9:48
    
When you power ON your system, your fist screen will be your chipset screen in your case you will see DELL screen where you will see a prompt/function key for entering in to Setup. it can be either the "DELETE" or a function key(example 'F2') button. Check that out and once you are there move to "BOOT" and see the options set over there for boot priority 1,2.. –  VRU Feb 2 '13 at 10:04
    
Well the first one is Hard drive and second removable drive... I do not think, that there is the problem –  Jendas Feb 2 '13 at 11:48
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