When I'm cold booting from my computer, this happens:

Motherboard Logo > Windows 8 loading logo > Black screen.

In the black screen, keyboard "num lock" key does not toggle the num lock LED. Pressing the power button once on my PC tower and wait a few minutes, my computer didn't shut down (it would if Windows is loaded properly but simply not displaying). The only solution is to force shut down by holding the power button for 5 seconds.

And then I'd power it on again, but this time (perhaps because the PC isn't cold in temperature??), it would work normally:

Motherboard Logo > Windows Logo > Login Screen > Desktop.

Now, in the desktop, everything is fine. Then:

  1. If I click "restart", it will restart properly, and everything will be fine.

  2. If I click "shut down":

    • If after it shuts down, I power it on immediately, everything is fine.

    • If I wait about 10 minutes (perhaps because the PC is cooled in temperature??), situation goes back to the beginning of this post.

I have tried to update GPU driver, uninstall GPU driver, change cable (from Display Port to VGA), unplug all USB devices except my mouse, disk scan, nothing changes.

My PC spec:

i7-4790K @ 4.0GHz, 2x4GB ddr3 RAM, 500 GB SSD, GTX 970 GPU, Gigabyte Z97X Mobo.

I'm out of ideas now... any help would be appreciated!

  • I have had similar, due to faulty PSU. I suggest however, you also update your chipset drivers. +1 for all efforts – Dave Dec 10 '14 at 15:43
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    "Pressing the power button on my PC tower and wait, does not shut down the computer. The only solution is to force shut down by pressing the power button for 5 seconds." - These statements are contradiction of each other. – Ramhound Dec 10 '14 at 15:56
  • @Ramhound Press my power button once, if windows is properly loaded, it would trigger a proper "shut down". I wait for a few minutes, my PC didn't shut down. I edited the question to make it clear, thanks. – user1032613 Dec 10 '14 at 15:57
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    My first suspect would be PSU too. What spec is it? – Tetsujin Dec 11 '14 at 8:45
  • @Tetsujin 80+ Certified 550W, I've been using it for a few months on the old PC so it shouldn't be RMA. Recently built my new PC with it. – user1032613 Dec 11 '14 at 16:48

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