Hi umaraminchohan,
Thanks for providing us this information. Please let us know which command you use to put the system to hibernate or sleep.
Also, let us know if system was shipped with Windows 8 or have you upgraded the same. Let us know the model number for the video card installed on the system.
If you have any further queries, please feel free to contact us.
Thanks and Regards
Sandeep P
#iworkfordell