If the color on the monitor display is not correct or it changes periodically, you may have a bad cable connection.
If your PC and monitor are two separate units, there may be up to three cables coming out of the back of the monitor and two connecting into your PC. There will be a power cable which will go into an electrical outlet, an audio cable, if your monitor has speakers, and the signal cable which is the one we want to check. The signal cable will be the larger of the two cables going to your PC.
Shut down your PC.
Follow the signal cable to the CPU, loosen the thumb screws and remove the connector.
Plug the connector back in and tighten the thumb screws.
Power on your PC and check to see if the display colors are now correct.
If you have a Macintosh computer and it is not an iMac:
Shut down your Mac and remove the power cable.
Follow the cable from the back of your display to the back of your Mac.
Re-seat the ADC (Apple Display Connector) by grasping the connector by the widest sides and pushing the tabs in to release the cable and pull it out.
Plug the connector back in. It will click in place.
Plug the power back in and power on the Mac.
Check to see if the display colors are now correct.
- If someone has logged into a computer and it has been inactive, the computer will be locked and no other users will be able to login.
- If another user needs to login and the last user is unavailable to unlock the computer, hold down the power button on the computer tower until the machine turns off. Then turn the computer back on. At this point, anyone who has a network logon should be able to login to the computer.
- Note: Any information that has not been saved will be lost.
- If after pushing the power button on your monitor the power light does not come on, please following the below solutions:
- Check the power cord connection in the back by unplugging and plugging it back in. Also check the receptacle on the other end of the cord. If it is plugged into a surge protector, make sure it is powered on. If there still is no power to the monitor, check to see if there is a separate power switch usually on the side or back of the monitor.
If this does not resolve the problem, please call the Help Desk at 303-352-7548.
Are the power lights lit for both the PC and display?
- No? Go to #1.
- Yes? Go to #2.
- Power light lit for the display only – go to #3.
- Power light lit for the PC only – go to #4.
(1) No power lights lit for PC or display
No power is going to the system. If plugged into a power strip make sure it is plugged into wall outlet and that the strip is turned on. If there is power at the wall outlet and no power to the strip, check the circuit breaker on the strip. The circuit breaker will be a small button near where the power cord for the strip enters (It is not the power switch). Try pressing the button in.
(2) Power lights lit for PC and display
Check the signal cable going from the back of monitor to the back of the PC. The cable connector has two thumb screws on it or it may have clips. Re-seat both ends of the cable by loosening the thumb screws or pressing the clips and removing the connector and then plugging it back in (The end attached to the monitor may not be removable).
(3) Power light lit for display only
Check the power to the PC. Start by checking to make sure the power cord which is located in the back near the top is pushed all the way into the back of the PC. Also, near where the power cord plugs in may be a power switch with a 1 and 0 on it. Make sure the side with the 1 is pressed down. Follow the power cord to the outlet it is plugged into. If it is plugged into a power strip, make sure the power strip is turned on and that the strip has power. Try plugging the PC into a different outlet
on the strip or directly into a wall outlet.
(4) Power light lit for PC only
Check the following:
- Press the power button on the front of the monitor.
- Check the power to the monitor by checking to make sure the power cord is pushed all the way into the back of the monitor.
- If the display is an NEC there may be a power switch on the left or right end of the display with a 1 and 0 on it. Make sure the side with the 1 is pressed down.
- Follow the power cord to the outlet it is plugged into.
- Try another outlet or try another power cord, if one is available.
If this does not solve the problem, call the Help Desk at 303-352-7548.
If the monitor display flickers causing eye strain, the refresh rate isn't set correctly you will see a noticeable flicker on the screen.
To change the monitor refresh rate:
Right click on the desktop and then left click on Properties
Click on the Settings tab.
Click on the Advanced button.
Click on the Monitor tab.
In the drop down menu for Screen refresh rate to see if the refresh rate can be
changed. If it can't, uncheck Hide modes that this monitor cannot display.
Click on the drop down menu pick a refresh rate above 60 Hertz (ex. 75).
After the refresh is set you may need to readjust your monitor screen size and
position using the controls on the monitor.
- This is usually caused by a bad connection either from the VGA/DVI cable or a bad connection in the laptop dock.
- If you're using a desktop computer, check the video cable connection between the tower and the monitor and tighten the connectors.
- If you're using a laptop, re-dock the laptop.