Results 1 to 2 of 2
  1. #1
    ROG Member Array
    Join Date
    Jun 2014

    Question Possible faulty Z390F MOBO (or memory), advice needed!

    I just finished putting together the hardware on a new build.
    CPU: i7 9700K
    MEM: G.Skill 32gb (2x16) RGB
    PSU: EVGA G3 850W,
    CASE: NZXT h700,
    MOBO: Asus rog strix z390-F

    So, after putting everything together and flipping the switch on the PSU (not the case) the computer already turned on. Why could this be happening?

    Also, my monitor doesn't turn on, so i can't access my BIOS. After some digging around it seems that it's some sort of hardware failure. Most likely the MOBO, but it could also be memory (the memory RGBs don't light up, every other hardware that has lights does) and less likely is that the PSU is at fault. I think. Also, my motherboards onboard leds light up this way:
    red - turns on and off (cpu)
    yellow - this one stays lit (dram)
    white and yellow-green - don't turn on (gpu and boot)

    Could it be my CMOS is empty? (very unlikely because i just got the motherboard like 2 months ago)

    With all this information, does this help somebody in narrowing down the possible issue?
    Thank you in advance for any assistance!!

  2. #2
    ROG Guru: Brown Belt Array MeanMachine PC Specs
    MeanMachine PC Specs
    Laptop (Model)I enjoy my wife
    MotherboardCVI HERO + CVII Hero Wifi
    ProcessorRyzen 7 1800X + 2700X
    Memory (part number)CMD16GX4M2B3000C15 + F4-3200C14D-16GTZR
    Graphics Card #1EVGA GTX980 SC for CVFZ
    Graphics Card #2EVGA GTX 1080 hybrid
    Graphics Card #3GTX 770 for phys x
    Sound CardMB
    MonitorHP w2408h
    Storage #1Samsung 970 EVO 500GB M.2
    Storage #2Samsung 840EVO 500GB and 960 M.2 pro
    CPU CoolerCorsair H105, H110 and H115i
    CaseCorsair 750D and 780T
    Power SupplyCorsair AX-1200i and Antec 850 pro platinum
    Keyboard Logitech K800
    Mouse Razer Mamba
    Headset Corsair Vengeance 2100
    OS W7 Ultimate 64bit and W10 pro 64bit
    Network RouterNetcom Wireless NF18ACV
    MeanMachine's Avatar
    Join Date
    Apr 2014

    When you hit the Power button to turn on the system, It goes through Post (Power on self test) where your hardware components are interrogated. Once all is OK then it boots to your OS. As your yellow led is constantly lit (DRAM_LED) then this indicates an error with your RAM and post will not continue till the error is rectified and so no output to monitor.
    Your first move will be to check your RAM. They are either a mismatch, faulty or there is an issue with the MB RAM slots.

    You can test your RAM in another system or run Memtest86 from a USB, You can try testing RAM by using just one DIMM Module and switching into differing slots. (ensure they are seated correctly)
    You should check that the RAM kit you have are listed on the MB QVL to ensure they have been tested and also ensure your Bios is updated.
    Last edited by MeanMachine; 06-14-2019 at 05:17 AM.
    We owe our existence to the scum of the earth, Cyanobacteria

    My System Specs:

    MB:ASUS ROG Crosshair VII Hero/WiFi GPU:EVGA GTX 1080 sc PSU:Corsair AX-1200i
    AMD R7 2700X Cooler: Corsair Hydro H115i Case: Corsair Carbide 780t

    Memory:G.Skill TridentZ F4-3200C14D-16GTZR SSD:Samsung 500GB 960 EVO M.2

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts