Quote from dont:
I have had this problem with sleep function before it was a harddrive that refused to come up when the computer came out of sleep mode. Hope that it helps. I just disabled sleep mode and used the PC for years.
I have not been able to use sleep/ hibernate correctly on desktops using W7 since it has been released.
Windows 7 sleep / hibernate has been a problem for a long time experienced by many people. There are many articles / threads on this, a quick google can access them .
Here is example...
http://answers.microsoft.com/en-us/...problems/45bcc01a-b2c6-4691-b6cc-3ea43d5ef748
http://gizmodo.com/5133399/win-7-tip-sleephibernate-mode-is-buggy-may-incapacitate-your-machine