Question about Dell Optiplex GX280 (99301) Motherboard

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No video, beep code 1-3-2, light code G-Y-G-Y, mobo replaced.

Hey guys, I had had a problem with the GX280 Dell Optiplex, tower model. The fan was running full tilt and the video wasn't showing, but it did have beep codes and so forth. I was told the resistors on motherboard had gone out causing capacitors to discharge their full power into the fan. I replaced the motherboard, and put a 1GB stick of RAM in the DIMM1 slot. The fan now runs okay, but still no video. I need to get past this series of happenings so I can enter BIOS and turn off the chassis-intrusion, which has been a headache on my other 280s. The beep code sounds like 1-3-2 or maybe 1-3-1-1, can't exactly tell....the light error codes out at G-Y-G-Y(A-B-C-D). Thanks for looking into this.


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  • heero6x6x6 Jan 12, 2009

    Found the problem, I checked and the RAM card I had put in it was a PC3200 stick. It has the exact same plug-in, i always thought that everytime they changed RAM designs, they changed the notch by atleast a tooth or more to act as a physical blocker from accidentally using wrong RAM....this seems to be an exception. A co-worker spotted it about 30min after posting my problem.

    Another question i have is this; i have seen people say the fans run too fast when the capacitors are blown, but support told me it was actually the resistors that hold the capacitors at bay, so they don't discharge except when needed, and that what happens is the resistors get weak and start letting the capacitors discharge more than they are suppose to....anyone else ever been told that?


  • naymx5 Jan 21, 2009

    i have the same problem but may have caused it my self. ive just
    acquired a gx280 desktop with no ram, i put 2 1gig sticks in and
    nothing would come up on the screen but there were beeps a couple of
    times i tried it. after closer inspection of the ram it turns out that
    its pc2-3200R. would this have now damaged the motherboard?

  • habte Mar 08, 2013

    my pc is dell optiplex 780 1, 2 is light bliking but the pc is not show anything that means not starting what is the case please help me soon.


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Beeps 6x

POST ("power on self test") codes for the Dell GX280 are in a format of n-n-n as in 3-1-2. This would sound like 3 beeps, followed by 1 beep and finally 2 beeps. If you're not paying attention, that 3-1-2 beep code could sound like 6 simple beeps.

Dell has a page for the GX280 dedicated to Troubleshooting Tools and Utilities. There's a great deal of information on it - but the POST codes you're looking for are explained in detail about mid-way down under "Beep Codes" This document and associated links should go a long way to help you properly diagnose the problem with your GX280.

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