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This is a backlight problem. The picture is there but there is no light from behind the LCD screen. It could be due to faulty capacitors, which are easy to replace. It could be a faulty Inverter transformer, which is harder to fix but he backlight controller board can usually be replaced at a reasonable price. If you have soldering experience you may be able to replace the faulty capacitors - look for capacitors with bulging tops.
Repalcing the inverter board in a job for someone with electronics experience. You can buy a universal inverter board for about £15 to £20 from e-bay.
20 inch monitors can be bought for about £100 to £150 so you need to decide whether it is economical to repair.
mcdevito75 here, The red power light usually means the monitor is off, if when you press the red button it turns to green, or blue then the red power button means the monitor was off. Your monitor could be burned out.
dpelrod727, Yes, the "switch-mode-power-supply" is in "partial" or "full" SHUTDOWN mode. Reconnect E172FP to a fully booted KNOWN good PC with the win-desktop as the displayed screen. Check with flashlight to see if your LCD panel is both BLACK and BLANK, or just BLACK by holding a bright flashlight 1" from screen at different angles even though the screen appears to be blank. If very faint image of desktop is seen then your SMPS is still half alive. Here are your options in either case. 1. Trade in for new. 2. Try Dell for a cash+old swapout for a Refurbed unit. 3. Check out www.ccl-la.com/badcaps, www.badcaps.net, www.lcdparts.net, and YOUTUBE long video clips dealing with LCD monitor disassembly and LCD repair. could be helpful in making decision on what to do. I'm 12fixlouie If this was helpful rate on fixya.
The monitor is going bad. Either going to be a bad screen or a bad inverter. Also Since you tried it on another computer and its still giving you the same symptoms, you know the computers are fine. To be sure, try another monitor on your computer and if you get video on the new monitor then thats another way of verifying that the dell monitor is bad.