Question about Compaq FS7550 17" CRT Monitor

1 Answer

Problem with the monitor

I have red green rectangles spread across the monitor, I tried formatting my pc, I also tried restoring default factory settings, can anyone tell if my monitor is damaged or if it's my Pc ? I have a Compaq FS7555 Monitor. When I perform a hard boot on my PC and the the monitor switches on..the displays show 3 retangular boxes stacked atop of each other. The top box is green and reads "Self Test G," the middle box is red and reads "Check Your PC And Signal Cable R," and the bottom box is blue and reads "Monitor Working B." Then the multi-color box disappears and reappears intermittently...continuously. Please advise.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 6,966 Answers
Re: Problem with the monitor


The three boxes represent the built-in diagnostics of the monitor. The letters G is green, B is blue and R is for red, the 3 color guns of the picture tube of your monitor. The words "Self Test" indicates that it is in diagnostic mode since it has powered up, it is also then expecting a video signal from a source to be coming in; the display "Check Your PC And Signal Cable" indicates that it is not receiving any video signal from the source which is your PC or more specifically the PC's video card; and the display "Monitor Working" indicates that the diagnostic has determined that nothing is wrong with itself and therefore it has got to be your PC that is in question. The intermittent appearance of the boxes is when the diagnostics restarts itself and eventually finds the same problem.

To determine if it is the PC or the monitor, use another PC (even a laptop with matching VGA output) and try it with your Compaq monitor, see it it will work or alternately, try a different monitor to connect to your PC. The outcome will determine which is at fault.

If you have determined/verified that it is indeed the PC, you should focus on the video/graphics card. In some PC models/versions, the graphics/video is built-in to the motherboard and you should check the memory since this is shared. The only way is to replace either.

Hope that this be of some help/idea. Pls post back how things worked out or should you need additional information.

Good luck and kind regards.

Posted on Dec 07, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

LG 700e crt monitor is showing all in rainbows!!!!

Remove any speakers or magnets that you might have near the monitor as they can cause visual distortion on your monitor screen.

Mar 05, 2014 | LG Studioworks 700S 17" CRT Monitor

1 Answer

Power is on but having blank screen

Check on what the color of your monitor's power indicator is. Usually, if its orange or red, it means it's on but is not receiving any video signal from your pc. If it's green or yellow, it is receiving signal so if your screen is blank, check on your monitor's video settings, like brightness could be set to 0 or try to restore your monitor's default settings. You can find these options on your monitor's menu button.

Jun 30, 2011 | Computer Monitors

1 Answer

Why would I keep getting a red rectangle box in the middle of my monitor screen that says " CONTRAST 100

It's there to notify you that a setting on the monitor is not wisely selected - lower the contrast to less than 80. Ideally you should reset the monitor to default values - use this option from the menu.

Sep 19, 2010 | Dell Computer Monitors

1 Answer

My monitor's color is mixed with the color yellow

There is an option on the monitor to reset colour to factory default. Just bring up the on screen menu by pressing the left most button at the botton. Use the button next to this to highlight the colour settings which I think is the 5th or next to last option down. You will then see the option to reset colour and various other factory default settings. Happy computing

Jul 21, 2009 | Samsung SyncMaster 940N Flat panel Monitor

1 Answer

Everything's Gone Green !!!

Try it in someone else's computer.

To see if it is the Monitor or the Video card...

Jul 07, 2009 | LG Flatron L1750S 17" LCD Monitor

1 Answer

I am unable to restore to factory setting. how
The link provides how to operate all your Dell Display functions including the reset to factory defaults

Jun 23, 2009 | Dell S199WFP 19" Monitor

5 Answers

Problem with the monitor

Have you tried another monitor on the PC? If the cable and connector pins are okay, I would suspect a problemn with the video / signal board inside the monitor.

Jan 21, 2007 | Sharp LL T17A4-B 17" Flat Panel LCD...

Not finding what you are looking for?
Compaq FS7550 17" CRT Monitor Logo

118 people viewed this question

Ask a Question

Usually answered in minutes!

Top Compaq Computer Monitors Experts

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

William Miller
William Miller

Level 3 Expert

8793 Answers

Ricky Ostrom
Ricky Ostrom

Level 2 Expert

270 Answers

Are you a Compaq Computer Monitor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides