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[Need help] Strange issue where computer will not boot unless unplugged for hours

Last response: in Components
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April 11, 2014 4:23:50 PM

First let's start off with some specs:
Asus Maximus VI Hero Motherboard
Intel i7 4770k CPU
2x MSI TF Nvidia GTX 660s (SLI)
1x Corsair Vengeance 8 GB 1600MHz RAM
Seagate Barricuda 1TB HDD
Corsair AX750 PSU
Windows 7 Ultimate

So I've had this problem for at least the last month where after my computer is turned off, it won't turn back on by either the case power button or the onboard power button (Which remains lit up along with the reset button) unless unplugged for multiple hours where it boots with no issues or errors besides for a small bizarre CPU fan error on the BIOS splash screen despite for there being no issues with my CPU fan.

I've tried clearing the CMOS, replacing the BIOS battery, removinging each part one by one except for the CPU, checking all my connections, moving the RAM card to every different slot, and nothing works except for leaving it with the power supply switched off for a few hours and coming back and turning it back on. I'm currently sitting in front of the computer with it unplugged wondering what to do.
April 11, 2014 4:27:55 PM

Can you list your system specs and some back ground as to when this issue started and what you have tried to fix it.
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April 21, 2014 2:48:20 PM

Hi. I currently have the same problem.

Whenever there's a power outage my PC will only boot after waiting several hours. Last time it was almost 2 days!

I think it has to do with a power management option on the BIOS, but since I'm a total noob, I am still researching the issue.

If I find a fix, I'll share!
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April 21, 2014 3:11:52 PM

If you have a Haswell CPU and a power supply that isn't rated for Haswell you can have all kinds of issues with the power supply thinking the system is off but the system is really in deep sleep mode. If that is the case you have 2 options. Option 1. go into BIOS and turn off the C6-C7 sleep state. Option 2. Install a case fan.
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April 21, 2014 3:17:00 PM

Morex said:
Hi. I currently have the same problem.

Whenever there's a power outage my PC will only boot after waiting several hours. Last time it was almost 2 days!

I think it has to do with a power management option on the BIOS, but since I'm a total noob, I am still researching the issue.

If I find a fix, I'll share!


If you are have power outage issues save yourself some headaches and get yourself a UPS.
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