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Sleep problem

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I am facing the same problem,Press sleep,Screen Black but sytem on.

any help.


Dell Vostro 3550, i5-2450M(2.50 GHz-Turbo Boost3.10 GHz) , RAM - 4 GB , Graphic - ATI Mobility Radeon HD 6630m 1GB(Switchable Graphics) , Chipset Intel PCH HM67, Yosmite 10.10/ Win 8.1 Pro x64/ Dualboot Chamelionwizard

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