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PC won't turn on after restart (no operating system, brand new build)

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March 12, 2014 3:44:11 PM

Just built my first pc using:
intel i5 4570 processor (with stock cooler)
Asus z87-c motherboard
Corsair cx600 power supply
Asus Radeon hd 7790,
Along hard drive and cd drive that I can't remember the names of.

Set it all up and got to bios fine, but then started getting CPU fan error messages despite the fan seeming to spin ok, but had N/A when viewing stats in BIOS. Saw somewhere to lower rpm warning value from 600 to 300, did so and clicked restart and apply in BIOS.

After laboured restart pc now doesn't power up, I get the motherboard light when turn on at the back, but when I try and power it up the power supply fan, CPU fan and graphics card fans spins then stops in 2 seconds without any other LEDs coming on (like the case fan led) checked cables and nothing is any different to before when it was working except the CPU fan plug was in wrong part of motherboard
a c 471 V Motherboard
March 12, 2014 3:56:25 PM

have you tried clearing the cmos..may be the mb or cpu thought the cpu fan had failed so the rig wont post for safty. also make sure the cpu fan plugged into the cpu fan and not the cpu fan opti port on the mb.
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March 13, 2014 11:52:56 AM

smorizio said:
have you tried clearing the cmos..may be the mb or cpu thought the cpu fan had failed so the rig wont post for safty. also make sure the cpu fan plugged into the cpu fan and not the cpu fan opti port on the mb.


How do you clear the cmos? The fan is now definitely in the CPU_FAN port... Also is it worth investing in a better CPU cooler? i'm going to be using the pc for games and was wondering if the stock fan would be adequate
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April 1, 2014 6:48:28 AM

It happened to me once. I changed my PSU and it worked well. Can you hear any beeping sounds when you turn it on? You can also try to clear the CMOS as stated above by finding the CLR_CMOS 2-3 pins either near the battery or not. You just place the jumper over the 2 pins and it will reset automatically (with the PC turned off) . If you don't have a jumper then use any conducting material. If nothing happens try removing the battery for 5 to 10 minutes and then put it back. It will reset the CMOS settings in your Mobo like of its brand new ;) 
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