ASUS P8Z77-V PRO CPU_LED Solid Red After Over A Year

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gkendall

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I build this system over a year ago and it has been working flawless ever since, until now. At first the ASUS AI Suite monitor flashed a warning saying that the CPU was at -1.0 Centigrade, as in really cold. Other sensors were reading completely invalid results such as the fan speeds were something like 65535! Not trusting AI Suite, I ran HW Monitor and all readings were fine. Then the system would run the fans faster and shut down, so obviously it thinks something is wrong and shut down to protect itself. I did check and all of the fans were working fine and didn't find any bad connections.

It is now even worse in that it won't even POST. When I power it on, the CPU_LED is on solid red. The only other LEDs that are lit are the SB_PWR which is solid green and the O2LED3 (EPU) which is solid green. There are no beeps. As it powers up, sometimes I see the power supply fan start spinning as well as the CPU fan start spinning but then it reboots in just a second or two and keeps re-booting over and over again.

So far I have removed the video card and the memory and that didn't make any difference, but I didn't think it would.

So I would assume the CPU_LED means it thinks something is wrong with the CPU. Since it can't get the CPU working, it probably doesn't bother to test the memory, graphics or boot device and just reboots.

So I'm pretty sure some component has died, but how do I know what is bad if the CPU_LED is solid red? I would assume it could be the CPU itself, the motherboard or the power supply. How do I figure out which is bad? I don't have spares of any of these to try swapping them out.

Thanks.



Here is my full build in case it matters:

ASUS P8Z77-V PRO 1155 ATX

INTEL CORE I5-3570K

G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL

EVGA 02G-P4-2680-KR GeForce GTX 680 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card

COOLER MASTER CM Storm Series Trooper (SGC-5000-KKN1) Black Steel / Plastic ATX Full Tower Computer Case

SeaSonic SS-750KM3 750W ATX12V V2.3/EPS 12V V2.91 SLI Ready 80 PLUS GOLD Certified Full Modular Active PFC Power ...

COOLER MASTER Hyper 212 EVO RR-212E-20PK-R2 Continuous Direct Contact 120mm Sleeve CPU

Intel 520 Series Cherryville SSDSC2CW120A3K5 2.5" 120GB SATA III MLC Internal Solid State Drive (SSD)Western Digital WD Black

WD1502FAEX 1.5TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive

ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk – OEM

Microsoft Windows 7 Home Premium SP1 64-bit
 
Solution
spawnkiller
i would suspect the motherboard itself first (had 4 ASUS board failed on me and all did something weird like this before totally won't post...)

you could also try another PSU, ASUS leds turn red when no power is plugged (maybe the 8 pin cpu don't work anymore)

FYI: ASUS board are P4P800 E-DLX, Rampage Formula (2 times) and P8Z77-V LK (all failed within 1 years)

PS: i'm more on the extreme side of overclocking so i suspect more the abusive use on my side, however Gigabyte P45 and MSI Z77 boards still work flawlessly at the same settings for my Q6600 4.05ghz and my 3770k 4.83ghz
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spawnkiller

spawnkiller

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i would suspect the motherboard itself first (had 4 ASUS board failed on me and all did something weird like this before totally won't post...)

you could also try another PSU, ASUS leds turn red when no power is plugged (maybe the 8 pin cpu don't work anymore)

FYI: ASUS board are P4P800 E-DLX, Rampage Formula (2 times) and P8Z77-V LK (all failed within 1 years)

PS: i'm more on the extreme side of overclocking so i suspect more the abusive use on my side, however Gigabyte P45 and MSI Z77 boards still work flawlessly at the same settings for my Q6600 4.05ghz and my 3770k 4.83ghz
 
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oczdude8

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since you don't have anything you can troubleshoot with, im afraid youre out of luck.

I can tell you that the chances of a cpu failing are very slim, and I would be doubtful that your psu would be bad since it is a good brand with appropriate wattage.

Edit: try removing the ram and booting up again and see if you can hear any beeps
 
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gkendall

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Also, I forgot to mention that I have not overclocked this system at all. Everything is running stock. It was plenty fast enough so I had no need to overclock.

I have already tried taking out the memory and the problem is the same. Still no beep codes at all.
 
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oczdude8

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most likely its a mobo issue then. Now if you have a voltmeter, you can manually test the psu, but its kinda dangerous haha. if you still have warranty for ur mobo, RMA that sucker
 
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gkendall

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I tried moving the jumper to clear the CMOS settings and removed the battery and that didn't make any difference. I also tried pushing the MemOK button (after putting the RAM back in) but that didn't make any difference either. I suspect the POST sequence tests the CPU before the RAM so if the CPU isn't working it probably doesn't bother the move on and test the RAM.

I'm very comfortable working around electricity and do have a couple of multi-meters, so I tested the PSU voltages next. All voltages in both the main 24-pin motherboard connector as well as the 8 pin CPU power connectors tested fine.

Luckily the CPU, the mother board and the PSU are all still under warranty, so I shouldn't have a problem getting them replaced, I just don't know which one to replace! At this point I think I'll just RMA the motherboard in hopes that's the problem. I wonder if ASUS will test it when they get it and let me know if it was bad?

Thanks for the advice.
 
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oczdude8

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RMA is a good idea. ASUS most likely will not even bother testing your mobo and will just send you a new one. I do know that they only test super expensive mobo's like the asus rampage ones which cost ~$500 a piece.
 
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gkendall

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ASUS processed my RMA quickly this morning, so the motherboard is on the way back.

The guy at ASUS actually recommended that I RMA the processor too, so I will likely do that tomorrow as well.
 
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