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Released in 2009, the Dell OptiPlex 780 Small Form Factor is a mini-desktop computer in Dell's OptiPlex 780 lineup. Identified by the model number DCCY1F.

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orange lightest blinking on the power button

I have a Dell desktop and the orange lightest blinking on the power button and then there's two little green dots blinking on the bottom of it and under those two green dots it's the number one and then it's also shows a number 3 and it will not power on even when I move the mouse it doesn't power on as if it was in sleep mode or something but that's not it.. I have a Dell Opti plex 780

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Hi,

If the green lights you described are shown in the image below, you may have a memory (ram) module problem. Hopefully that's all it is and not that it is memory controller problem

Block Image

Turn off the PC and disconnect the power from the PC and then open it up and remove/replace the memory modules from the systemboard and then check if it turns on or not.

If still no good, turn off the PC and disconnect the power from the PC and then if there are two or more modules, just remove all except one module and check.

If still no good turn off the PC and disconnect the power from the PC and insert the module in the other ram slot and check.

If still no good turn off the PC and disconnect the power from the PC and try the another module in both slots as per the 1st ram module and check.

Basically what you're trying to do is determine whether the problem is a memory module or a memory slot on the motherboard

Depending on which model variant of the PC you have, i.e. a USFF (ultra small form factor), a SFF (small form factor), a desktop or a MT (mini tower), here's the support webpage that has links to the service manuals for all the variants.

They show the necessary pre-requisite steps and the procedure to remove/replace the memory modules.

If a memory module is faulty all the PCs except the USFF use DDR3L-1600 UDIMM memory modules. The USFF model uses DDR3-1333 SO-DIMM memory modules

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