This box also appears during normal system operation if the video cable becomes disconnected or damaged.
- Turn off your monitor and reconnect the video cable; then turn on both your computer and the monitor.
- While in self-test mode, the LED remains green and the pattern remains on for 60 seconds.
If your monitor screen remains blank after you use the previous procedure, check your video controller and computer system; your monitor is functioning properly.
On-Screen Warning Messages
If there is something wrong with the input signal, a message appears on the screen or the screen goes blank although the power indicator LED is still on. The message may indicate that the monitor is out of scan range or that you need to activate it using your computer.
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COMMON SYMPTOMS |
WHAT YOU SEE |
POSSIBLE SOLUTIONS |
|
No Video/LED off |
No picture, monitor's dead. |
- Check connection integrity
- Electric outlet verification
- Ensure power button depressed fully
|
|
No Video/LED on |
No picture or no brightness |
- Increase brightness & contrast controls
- Perform monitor self test feature check
- Check for bent or broken pins
|
|
Poor Focus |
Picture is fuzzy, blurry or ghosting |
- Eliminate video extension cables
- Perform monitor reset
- Decrease brightness & contrast controls
- Lower video resolution or increase font size
|
|
Shaky/Jittery Video |
Wavy picture or fine movement |
- Perform monitor reset
- Check environmental factors
- Relocate and test in other room
|
|
Color Purity Problems |
Color is not uniform
Has color blotches or shades |
- Perform degauss
- Perform monitor reset
- Check environmental factors esp. woofers
|
|
Color Convergence Problems |
Characters show red or blue at edges |
- Perform monitor reset
- Adjust the color convergence controls
|
|
Missing Color or
Color Flood |
Entire screen is purple or yellow
Entire screen is red, green or blue |
- Perform monitor reset
- Perform monitor self test feature check
- Check for bent or broken pins
- Reseat the video card
|
|
Missing Pixels |
CRT screen has spots, specs or blemishes on the glass |
- If the blemish is on the outside of the glass, try cleaning the CRT screen
|
|
Brightness Problems |
Picture too dim or too bright |
- Perform monitor reset
- Adjust brightness & contrast controls
|
|
Geometric Distortion |
Screen not sized or centered correctly |
- Perform monitor reset
- Ensure monitor is in proper video mode
- Adjust the appropriate geometric control
|
|
Moiré (Thin Curvy Lines) |
Screen has wavy or elliptical lines
Screen has wood grain patterns |
- Ensure monitor is in proper video mode
- Adjust size first then the moiré controls
|
|
Horizontal/Vertical Lines |
Screen has one or more lines |
- Perform monitor self test feature check
- Check for bent or broken pins
- Horizontal lines could be damper wires
|
|
Sync Problems |
Screen is scrambled or appears torn |
- Perform monitor self test feature check
- Check for bent or broken pins
- Boot up in the "safe mode"
|
|
Audible Noise Problems |
Has humming sound or high frequency squeal |
- Ensure monitor is in proper video mode
- Reposition the monitor
- Loud hum when turning on is normal
|
|
CRT Scratched |
Screen has scratches or smudges |
- Turn monitor off and clean the screen
|
|
Safety Related Issues |
Visible signs of smoke or sparks |
- Do not perform any troubleshooting steps
- Monitor needs to be replaced
|
|
Intermittent Problems |
Monitor malfunctions on & off |
- Ensure monitor is in proper video mode
- Perform monitor reset
- Perform monitor self test feature check
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