Dell OptiPlex - Solid amber light, lights 2,3,4 blinking

Thanks for the info. It doesn't appear to be usb-related. Is there any way to fix a corrupt BIOS?

A 2-3-4 LED error codes point to system BIOS corruption or a USB short circuit error.

i have same issue facing 

Hello,
I have a Dell OptiPlex 990 as well with the same problem. Diag lights 2, 3 & 4 are flashing and the power light is solid amber. What are the chances 2 machines doing this in the same week? Mine just rebooted watching TV on it. And on reboot I had the error lights flashing. I have pulled all hardware that was installed one at a time and still the same results. If it's the BIOS, I installed A24 several months ago. Could it be a recent update from the Dell Support Assistant or Windows update? I am running Windows 10 PRO.

Thanks,

Tyler

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Regards,

Paventhan M

I've just had the same issue with my 990, 234 flashing amber and solid amber power led. Was there any resolution other than replacing the motherboard?

Seem odd that a few of us have had the same issue at a similar time. Makes me think it was update related. I can't remember what version bios I was on. Haven't updated it for a few years. It's quite possible windows did an update overnight before mine broke but I have no way of knowing

I've tried resetting/clearing the cmos and just about everything else.

https://www.dell.com/support/article/us/en/04/sln284978/a-reference-guide-to-the-dell-optiplex-diagnostic-indicators?lang=en#2012_to_Present

Power Button LED State Description

	Off	Power is Off. LED is blank.
	Blinking Amber	Initial State of LED at power up. Refer to the table below for Blinking Amber pattern diagnostic suggestions and possible failures.
	Solid Amber	The second state of the LED at power up, indicates that the POWER_GOOD signal is active and it is probable that the power supply is fine.
	Blinking White	System is in a low power state, either S1 or S3. This does not indicate a fault condition.
	Solid White	System is in S0 state. This is the normal power states of a functioning machine. The BIOS will turn the LED to this states to indicate it has started fetching op-codes.

Thanks, I'm aware the lights point to a corrupt bios being the likely cause. Do you have any idea how this could be fixed? I have already tried a CMOS reset, both with the jumper and by removing the battery.

I too am having the same problem on my 990 full tower.  Computer turns on, PSU shows green light, system fan and cpu fan go full blast, no video, blinking 2/3/4 on the LED status lights.

This happened within the past few weeks, just like everyone else on this thread.  I think it's more than just a coincidence at this point.  Is it possible a Windows update did this?

It would be great to find a fix to this somehow.  Pointing out the error to us is great and all, but simply saying "corrupt bios" does nothing to help us.

Indeed. One can read the meager dell documentation for themselves. No need for a parrot 

I can't really help you  (I'm not an expert dell musician),  but I doubt it's a windows update problem if you were unable to even boot into windows.  If you could, you would have indicated that.

If the bios is borked, there isn't a recovery option on older machines that I know of.

There could be an electrical fault on the motherboard. 

Unless a musician returns and plays a new guitar riff, I would replace the machine.

Hi,

I have the same issue with my Optiplex 760 after disassembling it and reassembling it. I tried to reinstall the BIOS from a flash drive, but I can’t manage to boot from it. And also I have a blank screen.

Thanks,

Csongor

change the processor it worked the error for bios and mother board