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New computer won't turn on, red CPU led

Last response: in Motherboards
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March 21, 2013 11:46:42 PM

I just put together my new computer with an Intel i7-3770k processor and Asus P8Z77-v motherboard and it turns on and all the fans work, drive lights turn on, then they all turn off. It happens over and over again and the red LED for the CPU is on every time. I have checked the pins, I don't see any bent ones and I was very careful. I believe I updated the BIOS correctly and I don't understand what the problem could be, could someone please help?
March 21, 2013 11:54:39 PM

Actually the red led is for the hard disk activity, are you sure you put the pin correctly?
check your mobos manual. again

ps the green led must stay on all the time because it say's that your pc is powered.
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March 22, 2013 12:06:27 AM

shuasgusdfal said:
I believe I updated the BIOS correctly and I don't understand what the problem could be, could someone please help?


So, your computer was working, then you updated the BIOS, and now it's not? That's not a good sign.

Flashing the BIOS is very, very risky. Doing it wrong can permanently kill the flash chip, and unless you're especially handy with a soldering iron that's not something you can fix and it's not covered under warranty either. It's entirely possible this is what happened.

First thing I'd do is try to clear the CMOS on the board. Your motherboard's manual will explain how to do this. If that doesn't work, chances are you killed your motherboard.

Moral of the story, don't flash your BIOS unless you have a very good reason to, or really know what you're doing. No offense, but given that you thought the LED was for the CPU, it's pretty clear you don't fall into the latter category.
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March 22, 2013 12:12:31 AM

check if your mobo has a dual bios setting from manual, if yes set it secondary bios.
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March 22, 2013 12:14:51 AM

willard said:
shuasgusdfal said:
I believe I updated the BIOS correctly and I don't understand what the problem could be, could someone please help?


So, your computer was working, then you updated the BIOS, and now it's not? That's not a good sign.

Flashing the BIOS is very, very risky. Doing it wrong can permanently kill the flash chip, and unless you're especially handy with a soldering iron that's not something you can fix and it's not covered under warranty either. It's entirely possible this is what happened.

First thing I'd do is try to clear the CMOS on the board. Your motherboard's manual will explain how to do this. If that doesn't work, chances are you killed your motherboard.

Moral of the story, don't flash your BIOS unless you have a very good reason to, or really know what you're doing. No offense, but given that you thought the LED was for the CPU, it's pretty clear you don't fall into the latter category.


I am not talking about the green LED that shows there is power going to the motherboard. There are other onboard LED lights that indicate if certain components are the problem such as the hard drive, DRAM, CPU, and VGA card. Mine happened to be the CPU LED. The computer never fully turned on either, I used Asus' "USB BIOS Flashback".
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March 22, 2013 12:29:09 AM

Is the 8-pin cpu power connector plugged in?
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March 22, 2013 12:38:38 AM

bignastyid said:
Is the 8-pin cpu power connector plugged in?


Ofcourse I checked if it was plugged in, what do you take me for? An idiot? Thanks dude I love you
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March 22, 2013 8:22:39 AM

shuasgusdfal said:
Ofcourse I checked if it was plugged in, what do you take me for? An idiot?


Then I'm sure you can figure this out on your own? I mean, you're not an idiot, right? It's not like you just flashed the BIOS on a brand new board for no reason, likely bricking it. Only an idiot, or somebody who didn't understand that they're coming here with their hands out asking us to take time out of our days and voluntarily help them with their issues for no reward whatsoever, would do that.

Somebody as smart as you has probably already realized that those LEDs you were talking about aren't going to be reliable troubleshooting aids if you corrupted the flash chip on the motherboard which controls those LEDs. Somebody as smart also probably also know all the basic troubleshooting steps to determine if the motherboard really is the root cause of the issue, and thus positively identify the problem even in the absence of debugging output like those LEDs. Somebody as smart as you also probably knows that problems like this are exactly why you don't flash the BIOS without a good reason.

Glad you sorted this all out yourself. Me, I had you pegged as a novice computer user that needed help. Glad I had that wrong.
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March 22, 2013 8:30:45 AM

willard said:
shuasgusdfal said:
Ofcourse I checked if it was plugged in, what do you take me for? An idiot?


Then I'm sure you can figure this out on your own? I mean, you're not an idiot, right? It's not like you just flashed the BIOS on a brand new board for no reason, likely bricking it. Only an idiot, or somebody who didn't understand that they're coming here with their hands out asking us to take time out of our days and voluntarily help them with their issues for no reward whatsoever, would do that.

Somebody as smart as you has probably already realized that those LEDs you were talking about aren't going to be reliable troubleshooting aids if you corrupted the flash chip on the motherboard which controls those LEDs. Somebody as smart also probably also know all the basic troubleshooting steps to determine if the motherboard really is the root cause of the issue, and thus positively identify the problem even in the absence of debugging output like those LEDs. Somebody as smart as you also probably knows that problems like this are exactly why you don't flash the BIOS without a good reason.

Glad you sorted this all out yourself. Me, I had you pegged as a novice computer user that needed help. Glad I had that wrong.


Haha I was definitely being sarcastic... it really wasn't plugged in, I wasn't making a jab at you or anything
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March 22, 2013 9:04:24 AM

If you ever assemble a computer and it does not work you should get some BIOS Beeps. Did you? If not maybe something is not plugged in right or you have a grounding problem or maybe the processor has an issue. At this point it is time to take everything apart or just unplug the peripherals like drives and remove the video card and test it again. If you still get nothing remover the motherboard and test it outside of the case on a cardboard box with only RAM and Processor. If it works then that means that the motherbord was grounding itself out or something like that. RAM might also be bad. Processor might not be seated. Then also the Power supply could be bad.

There have been a lot of bad hard drives so if you disconnect it that is one thing that might help to rule out other issues.
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March 22, 2013 11:47:55 AM

shuasgusdfal said:
I just put together my new computer with an Intel i7-3770k processor and Asus P8Z77-v motherboard and it turns on and all the fans work, drive lights turn on, then they all turn off. It happens over and over again and the red LED for the CPU is on every time. I have checked the pins, I don't see any bent ones and I was very careful. I believe I updated the BIOS correctly and I don't understand what the problem could be, could someone please help?


I just had the same issue last week with the same brand new board. I RMA'ed it and got a new one. New one works great. I don't think there is a whole lot you can do. I too had that cpu red light on as well and know which light you are referring to.
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March 22, 2013 3:58:32 PM

I guess you read the manual on how to clear the BIOS and tried that once or twice. That is one of the first things you always do before you do anything else.
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