Dell mtc2 pc wont light the monitor, a and b diagnostic light are yellow, c and d are green

Did you check with Dell? Is unit posting? Will not post if you have bad memory, peripheral, Try disconnecting everything except one stick of memory and see if it posts or you get something on the monitor.

The service manual for the Dell XPS 8300 doesn't show ABCD LED diagnostic lights. On other Dell models Y-G-Y-G indicates a video problem.

Rear Lights Dell Computer Error Codes

Rear LEDS are labled A through D and can change from green to yellow. Some typical LED reading might be:
A - yellow, B - yellow, C - green, D - green <-- Indicates a problem with the RAM.
A - yellow, B - green, C - yellow, D - green <-- Indicates a problem with the video card.
Refer to the Dell website for your specific model, as these lights can vary from model to model.

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Dell Computer Error Codes

Contact technical assistance.They will most likely ask you to send it back to repair.

This chart is where I got my conclusion.

Power Light

Problem Description

Suggested Resolution
Solid green
Power is on, and the computer is operating normally. On the desktop computer, a solid green light indicates a network connection.
No corrective action is required.
Blinking green
The computer is in the suspended state (Microsoft® Windows® 2000 and Windows XP).
Press the power button, move the mouse, or press a key on the keyboard to wake the computer.
Blinks green several times and then turns off
A configuration error exists.
Check the diagnostic lights to see if the specific problem is identified.
Solid yellow
The Dell Diagnostics is running a test, or a device on the system board may be faulty or incorrectly installed.
If the Dell Diagnostics is running, allow the testing to complete.
Check the diagnostic lights to see if the specific problem is identified.
If the computer does not boot, contact Dell for technical assistance.
Blinking yellow
A power supply or system board failure has occurred.
Check the diagnostic lights to see if the specific problem is identified.
Solid green and a beep code during POST
A problem was detected while the BIOS was executing.
See "Beep Codes" for instructions on diagnosing the beep code. Also, check the diagnostic lights to see if the specific problem is identified.
Solid green power light and no beep code and no video during POST
The monitor or the graphics card may be faulty or incorrectly installed.
Check the diagnostic lights to see if the specific problem is identified. See "Video and Monitor Problems" in your Owner's Manual.
Solid green power light and no beep code but the computer locks up during POST
An integrated system board device may be faulty.
Check the diagnostic lights to see if the specific problem is identified. If the problem is not identified, contact Dell for technical assistance.

When you turn on most dell monitors they come on with a yellow light, then turn green when the monitor and video source synch. If your light is not turning from yellow to green, your monitor is either dead or not getting a signal from the video source it's plugged into. Verify in your BIOS settings that you have selected to output video through an installed card and not from the motherboard source. If the BIOS settings are correct, your monitor has died. If the light is turning green after you turn the computer on, press the menu button on the monitor and adjust the brightness/contrast until you have a picture. If you don't see anything when the menu button is pressed, then again your monitor is likely dead.

Reinstall (remove and reinstall) your USB devices.

Could be memory error. Remove and reinstall your memory modules one at a time.

If not, could be your motherboard.

Hope this helps.

bought a new one. thanks! rg

Hi,

My name is ArmyMason, MTC2 is a model of power supply used for this computer. If this doesnt answer your question might I suggest using our premium service or live chat. Thanks.

Hope this answers your question.
ArmyMason

please refer to the below link...being dell support technician myself this link would give you the best possible help
http://support.dell.com/support/edocs/systems/dsleest/codemess.htm#diagnostic_codes

Hi

To help troubleshoot a problem, Dell Dimension 5100 has four diagnostic lights labeled "1," "2," "3," "4" on the front panel. When the computer starts normally, the lights flash. After the computer starts, all four lights lites solid green. The power button also lites solid green. If the computer malfunctions, the color and sequence of the diagnostic lights as well as the power button helps identifies the problem.

First, disconnect the power cord and remove all connections (Keyboard, Network, Mouse etc) as well as optional PCI Cards. Connect up the power cord (Monitor as well) and try powering the PC.
Check the diagnostic lights/system lights color and sequence and check the link below for more info (Assuming you have another system that can access internet)
Diagnostic Lights - http://support.dell.com/support/edocs/systems/dim5100/en/sm/tshoot1.htm#wp1120147
System Lights - http://support.dell.com/support/edocs/systems/dim5100/en/sm/tshoot1.htm#wp1114432

Reply with lights color and sequence as well as any beep codes and I will respond at best effort.

Mike