Twice in the last two days this has happened to my husband's computer. The monitor goes totally black but the power button is orange, so the monitor itself is fine, just not getting signal. The computer is so non-responsive that it has to be turned off at the power bar. It won't turn off or reboot from the usual power button.
We haven't added any devices or new programs in months. Mostly he's working on text files and running Europa Universalis 3.
The computer is a little more than three years old. The power supply is less than a year old -- we had to put in a new one to power the graphics card he needed for EU3.
Does anyone have any idea what's happening and what we can do about it? Thank you!