Nervous about Bleachbit, black screen and restart

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I recently installed Bleachbit in Ubuntu 12.04 and ran it sudo this morning with deep clean and wipe drive checked. It ran for some time then both monitors went black and seemed like my pc rebooted, I noticed them ran lights were off. When they came black them monitors are still black screens. Is this normal ? This has been at least 3 hours now. There is no responce from mouse of keyboard, no cursor. Do I continue to let it go of is there a problem ?