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Asus M5A99FX Pro R2.0 Red CPU Light Always On | PC Won't Start

Tags:
  • Light
  • Computers
  • CPUs
  • Heat
  • Motherboards
  • Fan Speed
  • Asus
Last response: in CPUs
July 22, 2014 2:01:42 PM

Hello and thank you for taking the time to read this.

Last week while using my computer it restarted twice on me. I would be on the internet or editing videos and it just restarted out of nowhere. So I was thinking it had to be a heat issue after realizing how quick the temperature rises while rendering a video and the fact the one of my fans had an extremely low rpm.

After a few hours my computer didn't restart and I thought I was golden. It restarted again and that was it for me. I opened my case made sure everything was plugged correctly and cleared off some dust. I also turned all fans to high and that fixed the low rpm issue. The GPU fans run and I did see a green light lit all the time on the bottom right of the GPU.

Here's the good one though, so not only did it not restart today but now it doesn't even start. CPU led right next to the Mem ok is always on red. Also I've been using this computer for about 8 months with no issues. This happened out of the blue. To me it's a heat issue but how would I know?

AMD FX 8320
Asus M5A99FX Pro R.20
Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing
G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1866 (2x)
Gigabyte Radeon HD 7870 2GB
Corsair 600W ATX12V

More about : asus m5a99fx pro red cpu light start

a b à CPUs
July 22, 2014 2:04:02 PM

make sure you have all your mobo screws in good and snug, and which corsair power supply do you have and when you computer is on does the power supply make any noise
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July 22, 2014 2:07:13 PM

zachparr2442 said:
make sure you have all your mobo screws in good and snug, and which corsair power supply do you have and when you computer is on does the power supply make any noise


I believe everything is intact but if anything I'll redo installation. Corsair 600W ATX12V and no there isn't any noise.
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a b à CPUs
July 22, 2014 2:08:26 PM

when its on do you smell anything burning or anything like that look around your board for anything that looks fried, also maybe update your bios
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July 22, 2014 2:15:44 PM

zachparr2442 said:
when its on do you smell anything burning or anything like that look around your board for anything that looks fried, also maybe update your bios


Nothing smells burnt. I also used a flashlight and everything seems fine. How would I update my bios? Thanks man.
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a b à CPUs
July 22, 2014 2:22:22 PM

you can go to your bios and look at which bios you have then go to the asus website i use a flashdrive see if you have the newest if not download the nesest one reset to bios then go upload the bios
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July 22, 2014 2:25:58 PM

zachparr2442 said:
you can go to your bios and look at which bios you have then go to the asus website i use a flashdrive see if you have the newest if not download the nesest one reset to bios then go upload the bios


But how can I get to the bios with no picture?
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a b à CPUs
July 22, 2014 2:32:33 PM

it doesnt start at all or does it start then turn right off?
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July 22, 2014 2:34:54 PM

zachparr2442 said:
it doesnt start at all or does it start then turn right off?


I hit the power button then GPU fans start and PSU fans but that CPU red light stays on and the case fans won't go on. That's all I get. No picture at all.

It stays on running but with no picture its stuck because of the red CPU light.
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Best solution

a b à CPUs
July 22, 2014 2:39:55 PM

i would redo everything replug everything reseat the heatsink take your gpu out and everything
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July 22, 2014 2:42:57 PM

zachparr2442 said:
i would redo everything replug everything reseat the heatsink take your gpu out and everything

Alright man thanks for all your help I'll be back with an update.
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a b à CPUs
July 22, 2014 2:52:18 PM

make sure your 8pin and 24pin mobo connections are good and your gpu connections are good also
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July 22, 2014 5:20:20 PM

zachparr2442 said:
make sure your 8pin and 24pin mobo connections are good and your gpu connections are good also


I removed the old thermal paste and applied a new spread. I also made sure all cables were tight. My computer is now up and running. Thanks for everything man I appreciate it.
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July 25, 2014 7:05:49 PM

Just wanted to say that I had the same issue. Followed the same actions of OP and got it back up and running! thanks to all who helped in the forum!
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August 4, 2014 1:24:17 PM

Ive taken the gpu out, reseated the cpu and heatsink, reapplied thermal paste and im still getting the red light and black screen :(  anything im missing?
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September 4, 2014 6:42:26 AM

I have almost these same settings and am getting the same solid red CPU light when I power on the computer. Why would the thermal paste inhibit it from turning on?

My particular PSU did not have 8 pin EPU slots, and I had to use a converter to hook up two 8-bin ends from the PSU to the EPU. Could this be a problem?
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January 2, 2015 9:19:51 AM

Hey Tom,

Any outcome to this problem, I have the same thing happening to me now
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