Out of Sleep modus no monitor action

My PC has motherboard: Asus M3A76-CM and a video card ATI Radeon HD3000. OS = Windows 7. When its going in to Sleep modus and when i then activate it by keyboard or mouse the PC comes alive but the monitor stays at sleep. Only by taking the power compleet of and starting compleet up the monitor comes back alive. I tried a other monitor zow that's can't be the problem. Can anyone help me ?
Hoofdpaneel:Asus M3A76-CMGeheugen (RAM)
DR2 2048 MB - 800 MHzInterfaces:6x USB 2.0
6x SATA II
1x IDE
1x PCIe x16
1x PCIe x1
2x PCI
1x Gigabit-LAN
1x PS/2
7.1 SoundChipset:AMD 760GVideo:ATi Radeon HD3000Vormfactor:Micro-ATXOnBoard-Graphic:1x VGA
1x DVIFitting:

Cable is tryed with other monitor. But i think cable can't be the problem. It works. Only sleep modus is problem.

i had a similar thing happen - and i managed to fix it by doing 2 things:

1. updating the ATK driver (windows update itself recommended a new one, but it didnt seem to 'take' and show the new version in device manager until i tried to install the ASUS tool which did not install due to compatibility issues but it did update the ATK driver. maybe it just needed a reboot which the ASUS tool forced - all this i'm still unclear on)

2. changing the bios option to enable "repost video on s3 resume"

wouldnt hurt to also see if there's a bios update for your board with the release notes hopefully mentioning they've fixed such an issue