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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
    New ROGer 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 2080 Ti FE
    Sound CardCreative Labs Sound Blaster AE-9
    MonitorSamsung 32" UH750 QLED UHD Monitor
    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 (ROG Certified)
    Power SupplyCooler Master V1200 Platinum
    Mouse Razer Basilisk Ultimate with Charging Dock
    Headset Bowers and Wilkins P9 Signature
    Mouse Pad Razer Vespula V2 Mousepad
    Headset/Speakers Creative GigaWorks T40 Series II
    OS Windows 10 Pro for Workstations
    Network RouterROG Rapture GT-AC5300
    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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