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My uncle has HP M9000T computer. I works fine. But when the system freezes when it comes out from sleep mode. It was not happening before. Suddenly this all stuff started. And yes this started after Windows Update. I keep my system on sleep mode for some time only and that is basically in lunch only. Now I can disable that completely but it is a issue and I want to get fixed.
There can be ram issue in the system. I have the same kind of issue with a laptop that has Vista. The system is not able get back from sleep mode. Another thing that you can verify is the video driver. It must be proper. Download the most latest video driver and update the same. Because without that your system will not behave properly. Old and outdated drivers are the common cause of black screen.