Hi,
After upgrading my bios to 1850 my wakeup from sleep mode broke. Fans and lights start working when you wake it up, but screen doesn't go up (and system is not accessible via network). Tried reverting bios update, didn't help. Then (thanks to google search) found this forum, and now, after disabling the PPL overvoltage it now works perfectly again!

Thank you guys !

Sergey.