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dell optiplex 790 not starting

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hello community my pc dont start  have this codes errors 2-3-4 

any solution thanks 

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7 Plutonium

Re: dell optiplex 790 not starting

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2 3 4 is not an error code.

2000:0142 is an error code


2  3  4   Lights on or  2  3  4 beeps are different things.


The computer can emit a series of beeps during start-up if the display cannot show errors or problems. These series of beeps, called beep codes, identify various problems.


Power button light Blue light — Solid blue light indicates
power-on state; blinking blue light indicates sleep state of the computer.
Amber light — Solid amber light when the computer does not start indicates a problem with the system board(CPU) or power supply.

Blinking amber light indicates a problem with the system board or Power Supply and or Addon Cards.

This is likely NOT a mini tower but you did not say which model.

Regulatory Model: D09M   Mini Tower.

Regulatory Model : D05D  Desktop.

Regulatory Model : D03S  Small Form Factor

Regulatory Model : D01U  Ultra Small Form Factor.


Regulatory Type: D09M001, D05D001, D03S001 and D01U002




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1 Nickel

Re: dell optiplex 790 not starting

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i have this problem no display open no bios open and write 2-3-4
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2 Iron

Re: dell optiplex 790 not starting

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the error means HDD failure (a simple hard cold fact)

the next step is always full and complete HDD tests.

we test it using the great tool called Ubunutu v16+ and newer demo disk or usb stick (free of cost, with free media in hand)

we do that and run the full SMART tests next, or spend all week loading any NEW OS,  and failing in 10000s of ways. ok>

do not skip testing hardware or you will be like puppy chasing his tail.

the bath tub life curve on HDD ends about 5 years. old.

so..... there you go on why and how.


also this old, the RTC coin cell  battery is due,, we test it 2.9vdc and blow is gone or going bad fast.

7 year life span spec on this cell. ok?

I am not Dell, I am retired from this industry since 2009,
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