Windows 7 shows blank screen after resuming it from sleep mode

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.