Check cables in the back of the monitor, and on the back of the PC.2.
It could be a faulty cord, or power supply.3.
Check the Device Manager for any problem occuring, around the same time the monitor went blank.
If there's a problem, you'll see either a red X, or a yellow exclamation mark, next to Monitors, or Display Adapters.
If it show a problem, right click the device, select Properties
, and under the General
tab, see if it tells you what the problem is.4.
Try updating the drivers for the Monitor, and Display Adapter.
There's a Tutorial here, explaining the process:How to update a Windows hardware driver