Was having this same problem and I fixed it. Check to make sure it's actually not waking! In my case the computer itself was waking but the display adapter was not. I could hear the processor fan come back on, the hard drives spin up, but nothing on my screen. In my BIOS, there was an option to not let the integrated graphics adapter sleep. It was called "RC6 Render Standby" and I turned it off -- fixed!
windows 8 won't wake up from sleep mode
I have a Dell desktop with Windows 8 and it will wake up from sleep mode if not in use for awhile but if left for longer periods it goes into sleep mode and will not wake up. I have tried to wake it
- touching mouse
- touching power button
- using windows key + C
- no results unless I do a hard power down
Now it has started to download windows updates without installing them
The best I saved for last...it will not shut down it only goes into Power Save mode
very frustrating...suggestions please?
Windows for home | Previous Windows versions | Performance and system failures
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Anonymous
2013-04-22T05:04:11+00:00 Same here. I have a 5 year old HP Slimline that never did this with Windows 7. So there Microsoft, the problem is Windows 8.
Now get on the ball and fix it!
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Anonymous
2013-04-22T02:35:03+00:00 I have HP EliteBook 8540p with Win 8, have already changed the Power plan to not to shut down anything like HDD or Screen for 4-5 hours, however, when I lock the computer that is putting laptop to sleep in next 20-30 minutes and then unable to wake up.
The only solution is to restart the whole machine. I shows no error code or nothing, acts like as every thing is normal again :)
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Anonymous
2013-04-09T11:46:23+00:00 I'm having this issue with my brand new Samsung Ativ T500, the troubleshooting tips don't make a difference
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Anonymous
2013-03-26T00:15:31+00:00 I have a new HP Envy6 and have been experiencing the same issue. Took my computer back to Geek Squad and they did a complete restore of the PC and the issue still persists. They did a hardware performance check and said it had to be Windows 8. Hopefully they will push an update to correct this issue soon.