As of 30-Aug-2020, I had this same problem. My ASUS motherboard was showing the CPU_LED light as solid red. QUICK ANSWER: Removed the CPU (and cooler), then put it back in. That FIXED it. Background: It is a ASUS sabertooth 990FX motherboard (ATX AMD). After my move from USA to Australia in 2020, my pc was transported in shipping freight sea container. Once I got all my goods and PC in Australia, I unpacked my pc and pressed the power button, the CPU_LED was solid red, and it would not start up, and it would not even POST. I searched online in forums and youtube, and this was the information that I found, and tried: I did the bench test again, remove all the components, HDD, SDD, etc. only had the motherboard, CPU attached, cooler attached, cooler fan and fan pin attached, 1 stick of RAM in the DIMM_A1 slot, the graphic card attached, the 24-pin connector from the PSU (PowerSupply) to the motherboard, and the 8-pin cpu power connector from PSU to motherboard. That is it. and tried to boot, but CPU LED was still red. I alternated the RAM in different DIMM slots, but still same. I disconnected graphics card, but still same. I cleared CMOS battery using the 3-pin jumper (it writes CLRTC on the motherboard, move the connect from 1-2 to 2-3 with pc off), but still same problem. (I also read something about north Bridge heatsink). I kept the motherboard still in the case, I just disconnected the cables. Then I phone called ASUS tech support in North America on +1 812-282-2787, since they would have received similar calls with this problem, and they might know where is the problem. Even though I built this pc in 2013, it was 7 years old, past the warranty period, the ASUS guy was still very helpful, he told me to take out the CPU and check for any bent pins and reinsert it, and also to clear the CMOS battery. Then when I was removing the cooler, I noticed that it was very easily able to be removed with the CPU still attached to the cooler, there was no grip of the CPU to the motherboard, it was like the CPU was loose on the MB, not connected properly. That is why I mentioned the pc was transported in a container ship from US to Australia, maybe from the vibration, the CPU got loose from the MB. (And I read in youtube comment that another persons ASUS motherboard has CPU LED red after he was transporting it). I had to separate the CPU from the cooler, but it was stuck on tight and the thermal paste was like cement. I did not use isopropyl alcohol. I tried using dental floss, but i could not get it in the gap. So I used a hair dryer blower and heated up the cooler for 15 minutes to heat the old thermal paste to make it soft. My CPU has no bent pins. I just cleaned off the old thermal paste, applied new thermal paste, and then re-inserted it, and it worked, connected everything, and worked. (if you get a BOOTMGR missing, Press Ctrl+Alt+Del, then you must of connected the hard drive cables to the different ports, just need to go into BIOS and change the boot priority order). [Cooler: Cooler Master 120mm. Graphics Card: XFX Double D Radeon HD 6950. CPU: AMD FX-8150. PSU: Corsair TX750]. My power supply unit says Universal input supply, so it works in 110v US and in 240v Australia. Regards, Kenan
Hello!
Just completed a new PC build last night. After firing up all fans and lights work except for GPU fans. There is no display with the GPU installed or uninstalled. I have a gigabyte aorus pro wifi board with amd ryzen 3700x. So far I have checked all connections, and re-sat the ram sticks. There is a red light displaying on the motherboard under "cpu". Multiple searches online I have yet to find anything. Thanks in advance.
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