[chriskennard]

I set my computer to sleep using the start button, then sleep button. But occasionally, especially when I let my computer sleep for about a day, it won't come out of sleep mode and forces me to restart! I have attached my DxDiag. Please Help!

 

[TriggerFinger]

I am not sure but if it is not plugged in and battery ran out then may be that would have caused it... requiring a restart. Also if the laptop went into hibernate mode then you need to press the power ON button again to wake it up.

 

[pittskatty]

This could be because your system after a while switches from suspend to hibernate. Then, maybe your hibernate file is corrupted. You can find a simple solution to this problem here: Fix Vista Sleep/Hibernate problem