Working with your sleep settings is what I would recommend after installing the most up-to-date drivers - which you did! You may want to check with the manufacturer of the computer and learn more about sleep options here: http://windows.microsoft.com/en-us/windows7/Sleep-and-hibernation-frequently-asked-questions.
Windows Outreach Team
Windows 7 Home Premium
Monitor Compaq Q1859
PC model is CQ5210Y
PC goes to sleep after long state of idleness then when the PC is brought out of sleep or restarted it shows no connection status and then immediately goes back into sleep mode. PC continues to run but monitor screen is black.
Partial fix unattaching then reattaching the monitor cable from the graphics port then the PC restarts normally, sometimes but it's getting worse.
Have reset sleep settings to never. It is working for the moment.
This looks like an OS bug or the monitor driver. Driver is the most recent version.