Asus M5A99X EVO R2.0 Red CPU/Mem LED

TheBradacus

Reputable
Apr 28, 2014
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4,510
My computer would randomly power off and now it won't turn back on. The power light is on and green but the cpu and my case led would turn on then immediately turn off. When i put my psu to a higher voltage, the power light is on and green, but the cpu led is red, no fans or my case led would turn on at all.
 
Are you talking about the little red switch in the back? that is only there for people how don't have the same type of power plugs than people within the states, if you messed with that you probably just killed either your power supply or another component in your system.
 
Your original post suggests that there is a problem with the CPU temperature. When CPUs reach their thermal limit (set in the BIOS), they shut down to prevent damage to the CPU.

On the other hand, since this mobo is backward compatible with AM2+ CPUs, it is possible that the AM2+ CPU, if overclocked in the past, could get crippled by this mobo. I experienced this first hand.

With this mobo, the LED next to the CPU socket illuminating red suggests there is a CPU problem.
 


I am using and am3+ cpu, but if the cpu overheated, would it bluescreen me, or just cut the power completely, not even giving me a blue screen. If it is the problem, i let it sit overnite, and then looked at the computer, including the cpu, and nothing was hot. Is there a way to fix it or is the cpu done? Also, since the cpu is the brain, it doesnt matter what i was doing to have it overheat right, because i was playing skyrim on ultra for like 8 hours straight and it didnt turn off on me.
 
When a CPU overheats, Windows may not report a Stop Error (BSOD), but usually there will be some kind of entry in the Event Viewer, which is moot, since you can't boot.

Have you tried breadboarding your system? If not, try it. If you don't know what this means, it is to build your system out of the case, with only the necessary devices for successful boot (1 RAM stick, CPU/Cooler, HDD, & PSU). Don't worry about display yet, you want to focus on getting the CPU LED to illuminate green.

If the CPU overheated and was damaged, there is nothing you can do to fix it. Before you go spending money on a new CPU or the postage to send it to AMD, for that matter, see if you can get your hands on an AM2+ or AM3+ CPU to test with your motherboard.
Alternatively, see if you can find someone nearby to test your CPU on their motherboard.