PC not waking up after sleep, (Win 7 64bit)

[ThirteenCat]

Good day genttleman,i need some help over here

ive just bought new mobo ASUS p8z77-m
and somehow one major issues occur.

once the display sleep,i cant seems to wake it up
my fan hdd led still there spinning like normal but the display remain black
while the monitor led just blinking as it has lost power with cpu

i doubt this had to do with software since it happens with 32 bit before i try with 64
googling result left me with bios setting and certain method which also leave me with dead end such as

- going to device manager>right click usb root hub properties>power management> allow this device to wake up the computer
but that choice is greyed out. i lost there

- playing with various windows power management setting such as disable hybrid sleep.disable usb suspended with no avail

- go to bios > AMP> enable wake up from PCI,PCIE but result still the same

ive yet trying to enable ErP from bios considering the only available option is S4+S5 or S5 but theres no option of S3?
or did i miss something there because S3 is the option that i want

- using powercfg command line to enable waking up device yet failed too


and most of the time,when screen becomes black ,i have to press reset button and it will reboot with windows did not shutdown properly yadi yada.
this is distressing

any PC guru here can shed some light about this, much much appreciated . Thanks


Cheers.

 

[gregrocker]

Update the Display driver. First run all Windows Updates (a performance update might also help) after enabling Automatically get recommended drivers and updates for your hardware (Step 3).

If that doesn't help import the latest driver from the PC or device's Support Downloads webpage.

If those don't help then work through these Sleep Mode Problems - Vista Forums .

Check the Performance log for clues at time of sleep, establish a clean boot, do the other Troubleshooting Steps for Windows 7

If all else fails you can determine the cause with certainty by Gathering a Startup, Shutdown, Sleep, Hibernate, or Reboot Trace - Windows 7 Forums
http://www.sevenforums.com/tutorials/2803-device-installation-settings.html