Hi Mahmood. I'm Greg, an installation specialist and 8 year Windows MVP, here to help you.
Most Sleep problems are caused by the Display driver, so try updating yours or try another one previously installed at Device Manager>Display adapter>Driver>Update Driver>Browse>Let me pick.
Microsoft basic display driver is only a placeholder driver, does not support sleep or hibernate, and is not the display driver for your PC. You should be able to find that on the PC manufacturers support downloads web page for your exact model, to download and install.
If that doesn't correct the Sleep issue then proceed with the rest of the steps I gave you which will always resolve it providing you have the latest display adapter for your PC or display device.
---------------------------------- I am a volunteer and not Microsoft.
Over 100,000 helped in forums for 11 years. I don't quit for those who are polite and cooperative.
Windows MVP 2010-21
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