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I have windows7 & ubuntu, After several days in shudown position,My system is not booting now. I an not even getting grub for OS selection. I have important data in hard disc How to restore & get important data?

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Try Boot-Repair – Mitch Jul 9 '12 at 5:12
most probably seems Hardware problem. – atenz Jul 9 '12 at 6:53

All you need to do is follow the documentation here.

Basically there a few methods, but the easiest is just making a CD with the ISO on it listed on the page.

It is a simple process and should get you back up and running.

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