Dell xps wont boot and the mother board has a blinking light that is labeled AUX_PWR

My dell xps won't boot and has a blinking light that is labeled aux_pwr. I thought it was psu issue so I replaced it and the problem is still there. Is there a problem with the motherboard itself or is there something else?

Edit: it is a del xps 8700 series
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    aux power means it is in AUX_PWR on the system board. the manual isn't clear what to do next...

    searched ona few dell forums (and man lots of people are complaining about the 8500 model
    have you tried the following suggestions;

    Did you try clearing BIOS?
    Power off and unplug
    Press/hold power button for ~15 sec
    Open case and remove motherboard battery
    Press/hold power button for ~30 sec
    Reinstall battery (right-side-up!)
    Close the case
    Try booting with only mouse, monitor and keyboard connected

    most posts on the del web site people ended getting their motherboard replaced yes.
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