There are some things to check to prevent this from happening again.
- Make sure the display is turned on.
- Make sure the display's cable is firmly connected to the computer's video card. It doesn't hurt to unplug the cable and replug it to be sure it's a good connection.
- If you have another display, try connecting it to the computer—that way you can figure out whether the issue happens with all displays (which tends to indicate the issue is with the computer) or if it's just the one display (which tends to indicate the issue is with the display).
- Turn off the computer, open the access door, and check the video card to make sure it is firmly inserted in the slot.
- See which video card you have:
In Mac OS X 10.3 and 10.4:
- Open System Profiler from the Utilities folder inside the Applications folder.
- Under the Hardware header in the column on the left, select "PCI/AGP Cards".
- Details of your video card (and any other graphics/displays) will appear to the right.
- When the computer is turned on, open Apple System Profiler from the Utilities folder inside the Applications folder.
- PCI will be the first item in the "Devices and Volumes" tab.
- Details of your video card (and any other PCI/AGP cards) will appear in the box.
If your video card model is identified as "ATY,RV350" and you still get the no-video issue even after you've done all these steps, you may need to replace the video card.
To replace the video card, contact Apple at 800-APL-CARE (in the United States or Canada) or the phone number listed in your inbox materials. Refer to this article number when you speak with the agent. If the Apple representative determines your issue to require replacing the video card, they may be able to send the card directly to you.