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May 22nd, 2024 18:43

error code confusion

On my optiplex 790, i get the code 12 4 then 3 then 12, if it starts up normally it will flash some other codes then go to nothing and start up normallly. if it stays at 1 2 blue power light, it will stay then beep and stay at 12 forever with no display or anything. Sometimes the pc black or white screens and upon rebooting, it goes to the 12 loop as mentioned before. I am currently testing other things such as mobo or psu failures and want to exclude an issue. is there anything i can do to fix this or is there any causes for this. i have heard the lights for older systems can be unreliable. it would be greatly appreciated if someone could help out.

7 Technologist

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10.6K Posts

May 23rd, 2024 00:53

replace cmos battery with a new CR2032 then clear cmos settings via mobo jumper.  will save you a lot of woes on dx code.

1 Rookie

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May 23rd, 2024 18:22

ok so i replaced the cr2032. i tried the cmos clear but when i put the thing on the two prongs it didnt start or give any signs of life at all,  and when i put it back on the original one it started fine. i cant find anything online about exactly how to do it and if it should turn on or not. what i did exactly was take the blue thing from one of the prongs to the other one, plugged it in, no sign of life. put the blue thing back on the original one and it had turned on fine and went back into the 12 loop i said before. do you know how to actually do it and what to do because i cant find any actual guides

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May 23rd, 2024 18:39

ok nevermind my previous post, i did it right but it made no effect on the issue so it wasnt related to that. i looked at the entire pc to see if a cable wasnt plugged in right but no. i cant find anything wrong with it. :(

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23-05-2024 20:00 PM

alr, so after some more investigation, the problem has something to do with either the gpu or pcie. So i tried unplugging my gpu altogether and the error code went away now only showing an error with no display cable to a gpu plugged in. i tried some extra 3.0 usbs in the slot i put my gpu in and the error doesnt appear, i have no way of testing the other pins unfortunately. i try it with the gpu and it gives me the 12 error. so this means that most likely the gpu is the issue. i have inspected the pins and capacitors in the gpu, a zotac gtx 1060  btw. however nothing is there. i can get a display port cable to see if the pc works without the gpu fine. something i have to say is that while i was messing with the gpu power cable i actually got it to give no errors but my hdmi didnt reach far enough to plug it in. so the issue is either the gpu, the gpu power cable, or the pcie, i think of course. anything i should try or anything to check would be great, i am gonna keep looking.
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