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  1. #1
    New ROGer Array
    Join Date
    Nov 2020

    Maximus XI Extreme/9900K Will not power on

    Hello all. Let me start with a list of parts to get that out of the way.*

    Asus Maximus XI Extreme
    Silicon Lottery Delidded 9900K running at 5.0Ghz all core*
    *Asus Thor 1200W PSU
    EVGA 2080ti Kingpin Edition
    EVGA sound card
    32 GB Corsair Ram (not sure of speed but was on Asus QVL)
    Full Custom Waterloop*

    With that out of the way, let me start. Built this system about 18 months ago and it has been a rock solid gaming powerhouse. Never had any problems until this morning. Before going to bed last night I shut down the computer and everything was normal. This morning I go to turn it on and all I get is about a half second of power with a click. Mobo and all components still have power as all the normal standby lights are on as normal. Mess around with it a bit and having done this a few times before I figured the PSU died. After work this evening I pick up a Corsair PSU just knowing that will fix the problem and get me running while I RMA the other one. As you my have guessed, this did not fix the issues. Exact same problem as before. So I dig in to all the troubleshooting I can think of like unplugging everything and disconnecting all the internal part to try for a barebones boot but all to no avail. The only clue I have, which I spotted when going frame by frame on a video I took of the issue, is that in that very short period of time the PC tries to boot, it shows a Q Code of CPU00 in the OLED screen. I am out of ideas and figured I would post here to see if anyone else has any ideas. Going to try to contact Asus tomorrow. Thanks all!

  2. #2
    ROG Guru: Orange Belt Array Jesseinsf PC Specs
    Jesseinsf PC Specs
    Laptop (Model)N/A
    MotherboardASUS ROG Maximus XI Extreme (Z390)
    ProcessorIntel Core i9 9900K
    Memory (part number)Corsair CMW128GX4M4E3200C16 - 128GB (4x32)
    Graphics Card #1NVIDIA - GeForce RTX 3080 Ti FE
    Sound CardOnboard TOSLINK to powered speakers
    MonitorMSI Creator PS321URV (32 in 4k HDR600)
    Storage #1Samsung 980 Pro M.2 PCIe SSD 1TB
    Storage #2Samsung 970 Pro M.2 PCIe SSD 1TB
    CPU CoolerLian Li Galahad 360 (3x Uni fan SL120)
    CaseLian Li PC-011 Dynamic XL Black (ROG Certified)
    Power SupplyCooler Master V1200 Platinum
    Mouse Razer Basilisk Ultimate with Charging Dock
    Headset Bowers and Wilkins P9 Signature
    Mouse Pad LOFTMAT (16x13 inch) Cushioned Gaming Mat - "The Gaming Slim"
    Headset/Speakers Vanatoo Transparent One Encore with Rel HT/1003 Subwoofer
    OS Windows 11 Pro for Workstations 64-bit
    Network RouterROG Rapture GT-AC5300 (Using Spectrum 400MB service)
    Accessory #1 Microsoft Xbox Elite Wireless Controller Series 2
    Accessory #2 2x Logitech BRIO ULTRA HD PRO WEBCAM
    Accessory #3 7 Uni Fan SL120 fans for PC case
    Jesseinsf's Avatar
    Join Date
    Mar 2019

    Another forum had a similar issue and had to replace the Motherboard. You said you had a custom loop. Maybe there was a very tiny leak that shorted something very slowly.

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