If it's an external monitor, turn off the monitor and the computer, unplug the monitor from the computer and plug it back in again and make sure it's in all the way. The crazy colors you are seeing are due to a loose connection someplace. If it's on a laptop, you need to pull the ribbon cable and reseat it and it will fix it. I have worked on Dell laptops that have that problem and it's surprisingly simple to fix.
If it's external and still does that after you pull it out and put it back, then it's time to tear it apart and look for any loose connections on the inside.
SOURCE: E153FP Monitor screen goes black light is green
The capacitors are probably bad. It is a common problem and easily fixed by taking it apart and replacing the capacitors. Try to find Rubycon Capacitors because they very rarely go bad. Do a search on google for bad caps. I have fixed about 30 monitors this way. Dell is a company well known for bad capacitors. It may not be your problem but replacing the capacitors should cost less than $10 if you do it yourself. www.photphot.com
SOURCE: Dell E172FPb 17" LCD Monitor Problem
Your inverter power supply has gone bad. You will need to replace the whole board or replace the the 2sc5707 transistors in the inverter area. Check out this link for installation videos and how to for that model
http://www.lcdrepair.us/Installation.html
They also sell the whole board as well as repair kits
SOURCE: Dell E172FPb monitor black screen green flashing power button
Hello,
We have a dis-assebly and repair guide posted on our web site at:
www.ccl-la.com/monitor_repair.htm
The problem is usually the driver transistors, our guide shows where they are and what to replace to get your monitor back running again.
I hope this helps, If so please rate my solution.
Buddy
Corporate Computer
www.ccl-la.com
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