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  1. #1
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    Post My newly built computer isn't working :(

    I built my very first PC, but after I finish assembling it, I boot it up and it says Reboot and Select Proper Boot Device. Also when I plug my keyboard and mouse in, they won't turn on so I can't fix anything while in BIOS. I don't know what to do.

    PC Parts:
    CPU: Ryzen 1700x
    CPU Cooler: Arctic Freezer 33 Esports One
    Motherboard: Gigabyte GA-AB350 Gaming 3 (AM4)
    RAM: G.Skill Ripjaws V 2x8GB DDR4 (3000mhz)
    GPU: MSI Gaming Radeon RX 570 (RX 570 Armor Mk2 8GB OC) (Red)
    Power Supply: EVGA SuperNOVA 550 G3 (550W) (80+ Gold Fully Modular)
    Storage: Seagate Barracuda 2TB 64Gb/s (3.5in.), Samsung 860 EVO 500GB (2.5in.)
    Case: NZXT H500
    Keyboard: Corsair K55 RGB
    Mouse: SteelSeries Sensei Laser Gaming Mouse RAW - Rubberized Black

  2. #2
    Older by the minute
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    Default Re: My newly built computer isn't working :(

    You don't mention what operating system you are using. Were you able to load it down successfully onto your SSD?

  3. #3
    Soaring like an Eagle gary67's Avatar
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    Default Re: My newly built computer isn't working :(

    Can you boot from a flash drive or CD? It seems the motherboard isn't recognising the harddrive

  4. #4
    Short Member pcuser42's Avatar
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    Default Re: My newly built computer isn't working :(

    That error message is normal if an OS hasn't been installed yet, as there's nothing to boot from.

    Does the keyboard and mouse work on another PC?

  5. #5

    Default Re: My newly built computer isn't working :(

    The keyboard should work in the BIOS. Make sure its plugged into a port at the back. Try a USB2 port if USB3 doesn't work.

  6. #6
    Computer Technician wainuitech's Avatar
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    Default Re: My newly built computer isn't working :(

    Quote Originally Posted by autechre View Post
    The keyboard should work in the BIOS. Make sure its plugged into a port at the back. Try a USB2 port if USB3 doesn't work.
    Just adding to Autechre's comment, make sure the keyboard /mouse are plugged into the top ports. it shouldn't really matter but sometimes they dont like others.

    Click image for larger version. 

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    Update / Upgrades = Replace old bugs with new ones.

  7. #7
    Senior Member piroska's Avatar
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    Default Re: My newly built computer isn't working :(

    Sometimes there is a setting in the BIOS for legacy keyboard (USB).





    enable it.

    Selecting proper boot device....is the boot drive plugged into sata 1?
    Is it an SSD? Is the partition active?
    In UEFI bios disbale Legacy boot.


    Is boot order correct?
    Ex-pctek

  8. #8
    Senior Member 1101's Avatar
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    Default Re: My newly built computer isn't working :(

    Quote Originally Posted by My_boi_Russell View Post
    Also when I plug my keyboard and mouse in, they won't turn on so I can't fix anything while in BIOS. I don't know what to do.
    Thats the first thing to concentrate on. Not much you can do if kb doesnt work.

    as above, try other USB ports, try another kb (without mouse) .
    does the kb numlock/capslock light come on when you push those
    Is it a wireless or gaming kb ?.
    unplug front USB connectors , unplug all cables except power on cable .

    If a kb doesnt work on that board, you may need to take it back

  9. #9
    Computer Technician wainuitech's Avatar
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    Default Re: My newly built computer isn't working :(

    If any of the above doesn't work, one more thing you can try -- Remove the Motherboard (leave the CPU/Fan and memory attached/installed) & Power Supply. Put the board on a bench hard surfaced /table, connect the Keyboard /mouse/ Power Supply / Monitor, Plug in the power Supply. DONT use a separate Graphic Card, use the onboard.

    You can connect a HDD if you want but not required.

    Once plugged in, touch with a small flat bladed screwdriver the Power Pins, this will kick the board into life ( this is all the power button/switch is doing) you should be able to boot into the BIOS, if Not then theres a possible fault on the board.

    As marked in red :
    Click image for larger version. 

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    If it boots into the BIOS and the KB/Mouse work, then on the original construction, either something was not connected correctly OR more often something may have been short-circuiting.
    Last edited by wainuitech; 08-07-2019 at 05:21 PM.
    Update / Upgrades = Replace old bugs with new ones.

  10. #10
    Soaring like an Eagle gary67's Avatar
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    Default Re: My newly built computer isn't working :(

    Hmm they haven't come back so possibly some spam coming our way soon

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