The yellow light OptiPlex 990 / 2,3,4

I have a two Optiplex 990 who stopped to boot the system. They light... fans spin up the DVD player turns... but then Diagnostics lights 2,3,4 and show the power button turns orange instead of green.

The system then just guard road and stop with the constantly diagnostic lights.

I tried to remove the HD, CD drive, graphics card, CMOS, both fans. None seem to solve the problem. On one of the two, I replaced the motherboard. That did not help also.

I have also reset the memory on units

Grateful for any help!

E

I have the same problem with dell optiplex SFF 990... There was also a previous optiplex 790 with the same problem, but the two, I was able to fix... I opened the power supply and discovered curved 2 capacitors (2200uF 10V) and replaced both.  Now the two systems work well.  It of a cheap cap and should be replaced with the quality of those like nichicons, etc...

It might be possible to also find caps curved on the card mother esp on the area of heat sink.

If you are not technical then, go to an electronics store and have your powersupply be summarized / renovated... Note: before you fix it myself i tried the built-in self test for the power supply (press small black button located on the back) and he said the PSU is good and also I measured the voltages of each individual output (5V, 12V, 3.3V) and all gave good reads but you cannot be sure because there is still no load.  So as I suspected I opened the power supply and discovered the bulging caps / leaks...

Hope this will help you all.

Tags: Dell Desktop

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