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All the fans (CPU, system fans, PSU) keep running after I shut down Windows 8. This is also the case when I put the system on sleep or hibernate. Sometimes the fans run at full speed after shutdown and sometimes they run at lower speeds. This has nothing to do with high temperature. All the parts are new and it has been like this since day one. The motherboard is a Gigabyte Z87-HD3

I have tried disconnecting the power cable, holding the power button (to "empty" the power) and disconnecting/reconnecting the fan cables.

EDIT: Powerled is also on after shutdown/sleep/hibernate

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2 Answers 2

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It turned out that the pins on the CPU socket were bent, this must have happened when installing the CPU.

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The first thing I would check for is if there is a newer BIOS available for your motherboard. If there is then flash that. Be warned that there is always an element of risk in flashing a new BIOS.

It sounds like an ACPI issue. If a newer BIOS is not available or flashing one doesn't correct the issue then check the manufacturers web-site and see if there are any drivers for your motherboard available. You should not need to do this, it should just work, but obviously it isn't working.

Edit: BIOS may also be called "firmware" if you have a UEFI motherboard.

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  • Now the computer won't even boot. It just shows a cursor on the screen then goes "No Signal" then sounds like it's restarting then repeats.
    – Mechk
    Sep 21, 2013 at 8:48
  • Did you do anything or did this new behavior start on its own?
    – headkase
    Sep 21, 2013 at 8:51
  • I tried to start windows in safe mode by holding down shift when pressing restart, but I accidently pressed shutdown
    – Mechk
    Sep 21, 2013 at 8:52
  • And? Have you unplugged the computer from the wall and pressed the power button to discharge the capacitors and then replugged it and see if it will POST?
    – headkase
    Sep 21, 2013 at 8:54
  • Yes and windows won't start, the thing with the cursor and no signal keeps repeating
    – Mechk
    Sep 21, 2013 at 8:55

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