Diagnostic code doesn't exist.

[Travianw135]

My computer has been working almost flawlessly for close to two years, and it just decided to stop. Its a Dell Optiplex 990 (Small Form Factor version)

- Intel Core i3 2120 - Dual core, Turbo to 3.3GHz, Sandy bridge.

- Nvidia Leadtek 8400 GS

- Samsung 64GB 830 Series

- Samsung 128GB 840 Pro

- 64-Bit Windows Home Premium if it helps, but it doesn't make it that far.

 

I pressed the power button, and about a second in a diagnostic light was on, the monitors were blank, but the computer was powered on, fans running, heat from the CPU. I did what I always did when there was a problem, I looked at the diagnostic lights and the colour of the power button. The power button was blue and the only the "3" light was on. I brought out the service manual and went to the light readout page (Pg 69 in the link below) and looked for the appropriate arrangement. It wasn't there. There was a troubleshoot for "3" and no light on the power button, I tried the fix for that anyway, and it didn't work.

 

I did the usual, power cycled a few times, drained the power, changed the RAM around, made sure everything was plugged in correctly.

Any other suggestions? Am I missing something in the manual, is there another possible problem, is this it for that computer? Any advice is welcomed, and if more information is required, I can always add more.

 

Service Manual: ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-990_Service%20Manual2_en-us.pdf

[ZetZet]

mobo or gpu if nothing happens, from personal experience.

[acidydragon]

Check the RAM, is it seated right? (I just had an issue similar to this, but with a completely different motherboard.)

[softstone]

Maybe a GPU problem? Since you have no output on your monitors. Electronic devices are known to just break after a certain amount of time, mostly due to heat.

[Travianw135]

mobo or gpu if nothing happens, from personal experience.

Yeah, looks like it was the motherboard. Changed all of the RAM around, tried another identical 8400, onboard graphics, nothing. New board it is. Thanks for the help!