New computer: Black screen after some minutes and power still ON

Good morning,

Just bought a new computer from a retailer 1 day ago.
After some time of playing (about 30mins to some hours), the screen turns OFF but the power is still on.
At that point I can only shut it down (press for 10sec).
It also seems that all the fans are going in max speed when this is happening.

The computer is:

- CPU: i7 3770k on turbo mode (no OC)
- Motherboard: Asus P8Z77-V in normal energy consumption mode. When it was on "energy comsuption" mode, it used to crash very often.
- Memory: Kingston 8go CL10 DDR3 1600 http://www.newegg.com/Product/Product.aspx?Item=N82E16820104301&Tpk=KHX1600C10D3B1%2f8G
- Graphic Card: Sapphire Radeon 7870 2Go - OC
- PSU: Corsair HX750
- Air cooling: CoolerMaster 212 Evo


The computer is out of the box, there is no overclocking whatsoever and every motherboard setting in on Auto.

The actions I have taken so far are:

1) Changed motherboard "Energy saving mode" to "Normal Mode"
2) Installed OCCT, FurMark, Prime95 to try and reproduce

Here is the the CPU-Z validate for reference: http://valid.canardpc.com/2569521

At the moment, I don't even know what to do and where to start ?

Please help, thank you
10 answers Last reply
More about computer black screen minutes power
  1. I would contact the retailer for RMA-ing.
  2. Ok, I forgot to say that Memtest test passed succesfully with 0 errors.

    I'm trying to run OCCT and monitor temperatures/voltages at the moment.
  3. The Apci modes are set wrong in the bios.
    After 30 mins of no activity a signal will be sent to the graphics card telling it to power down, the screen will go blank.
    However if the wrong Apci mode is set in the bios the signal to wake the card up is not sent or received so its why the screen is black but the system seems like it is still running.
    Look in the power section of the bios, Apci and check what mode it is set to. S3,S4 ect.
    S1 is a bork !
  4. alexoiu said:
    I would contact the retailer for RMA-ing.


    Yes, that is 100%. They will see me as soon as the shop door is open.

    Meanwhile since there is 48hours during that time, I'm trying to find out where the problem is.
  5. weaselman said:
    The Apci modes are set wrong in the bios.
    After 30 mins of no activity a signal will be sent to the graphics card telling it to power down, the screen will go blank.
    However if the wrong Apci mode is set in the bios the signal to wake the card up is not sent or received so its why the screen is black but the system seems like it is still running.
    Look in the power section of the bios, Apci and check what mode it is set to. S3,S4 ect.
    S1 is a bork !


    I have checked all the settings, but there is nothing coming close to ACPI or S1, S3.

    Everything that comes close to power is like this:

    - EPU Power saving mode is disabled
    - APM: ErP disabled (everything in the APM section is disabled)
  6. Here is the result of the OCCT CPU stress test.

    Looks like the PSU is dead to me ...

    http://imageshack.us/g/1/9849243/
  7. Sounds like you are experiencing this problem that may be affecting some Sapphire 7870 cards.

    http://www.techpowerup.com/174858/Some-Sapphire-Radeon-HD-7870-Cards-Affected-by-quot-Black-Screen-quot-Issue.html
  8. Just passed all OCCT tests ...

    I don't understand what's going on ...
  9. Ok going to RMA the graphic card and ask for a free upgrade aswell.
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