I have Ubuntu 12.04 by installed on my Inspiron N5030. Its my only operating system. Recently, ubuntu had a problem with resuming from hibernation. This has happened before, and I simply held the power button until the system shut down and restarted without a problem. Now I did the same thing once again, except this time, my system wont boot. Could I have damaged ubuntu by shutting my computer off manually? Is there anything I can do to fix it? I'd really rather not lose all my data.
As Joshua commented, try to take out your battery and unplug it from the power supply. Then press the power button and hold it for 20-30 seconds.
It should not have anything to do with your os if you get no error messages.