I have a dell monitor model e172fpt i have power when it turn on has white on the screen and turn on blue and black screen

2407WFP, PSM, flashes red, green, blue, black, white, repeat

https://www.dell.com > community > Monitors > td-p

2407WFP, PSM, flashes red, green, blue, black, white, repeat. Hello,. My 2407WFP won't go into power save mode, even when the computer is turned off.

make model (what it is)
in all questions please. More info on the MYSTERY object

https://www.google.com/search?q=Why+is+it+flashing+red-blue-green

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I have a strong suspicion that you have burned a capacitor or two on the monitor. You will need to bring this in to have it serviced as it will require the monitor to be opened up and new capacitors replaced/resoldered.

sounds to me like it is password protected ! try going in to bios and reseting the password ? hope this helps !

It will need parts or board repalcement.
Board is only $30, http://www.lcdrepair.us/e172fpt-inverter-power.html

If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed DELL monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.

Replacement board: http://www.lcdrepair.us

1280 x 1024 @60Hz, try this setting on your PC video resolution seting.
http://www.fixya.com/support/r4873371-fixing_out_range_format_not_supported

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

Try this: http://www.fixya.com/support/r4554052-dell_monitor_lock_unlock_instruction

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Please post back what you find.

Your Problem Is not in your Monitor Its in your CPU. Your CPU is not giving Display Signal to Monitor that's why Monitor goes to power saving mode. try to open Your CPU and remove RAM Clean RAM Slots and Fix it Again. Try to Boot now.

Click the Menu button and use the '+' & '-' signs to select restore factory settings. Check if you get the same line in the BIOS screen, if so then you would need a replacement.

Need to replace inverter 20-50 dollars on ebay, lots of tutorials around the web

It's a pretty easy fix if you can solder. Get the parts here:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=220476282873