Windows 7 shows blank screen after resuming it from sleep mode

I'am using Windows-7 Home Basic 64 Bit OS. My system has stopped coming out of sleep mode. i.e. if I manually do sleep from shutdown menu, or close the lid, or sleep due to power plan, after re-opening the system, screen doesn't show anything. It remains blank. But everything works the way it should. i.e Hard-Disk, OS keeps running and I can shutdown also by pressing alt+F4 and Enter (in the blank).

I updated display drivers, Graphic drivers, Chipset drivers to the latest version. What could it be? (corrupt hibernate file?)

The c:\hiberfile.sys file is not used for sleep mode, only hibernation. So corruption of that file is definitely not the issue here.

This is almost certainly a driver issue. It looks like your graphics card is not correctly handling going from S3 back to S0 (sleep back to fully powered on).

1) Try updating your graphics card driver

2) Try rolling back your graphics card driver to a previous known good version

3) Failing that driver rollback, try using System Restore to go back to a system state prior to the manifestation of your problem.