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I have Lenovo z580 with windows 8 preloaded. I removed it and installed a fresh copy of Ubuntu 13.04 64 bit. When I start my laptop, it sometimes hangs with a black screen and with a cursor. This happens frequently. If I long press my power button and reboot the system, it loads normally.

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Probably too late to be of help to the asker, but perhaps of help to others stumbling upon it, the answer is probably to be found here: Ideapad Z580 won't boot kernels above 3.2.0-32

Some Lenovo laptops (including the Z580, on which I'm writing this) are reported to have a battery firmware problem, the (rather complicated) solution to which is given in the above link.

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