Screen Image Blown to Bits! DVI D, 13.04

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http://ubuntuforums.org – I leave my system running, having watched perhaps a video, and I leave. Later when I return, the system is sometimes locked up and the monitor displays bits and pieces of prior interactions. For example it displays "Password: *******" and then in another location it might display something else. Random characters are also present. I am unable to recover the system via say through ctrl-alt-1 or other techniques. I found nothing in the logs at /var/log that suggested a problem. The fact that this problem occurs when I am away from the system makes me wonder if this is related to a (Hardware)