M4600 issue : IPS screen black after wake up !!!!

Hi everybody,

I just had an M4600 replacement after some audio issues with my previous M4600.
Just made a fresh win7 64 install on my mini SSD, I realized that the screen remains black wake up after standby.

I've updated to A07 bios, changed nvidia drivers, pressed power button 20 sec w/o the battery, still the same> it seems that the screen remains off, but I know the computer wakes up...

I've ran all the pre-bios tests, all passed with success...

I'm planning calling Dell, but I'm surprised I'm the only one experimenting that trouble, anybody else ?????

 

I had something similar, though not after standby. I was playing some blue-ray mkv file using Media Player Classic x64. At some point display driver crashed and main display go black, though external display worked ok. Restart of Windows didn't seem to help. Only turning the computer off and on again ressurected my display.