Asus Z87-A VGA_LED light not turning off - not posting.

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dideej848

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Oct 24, 2014
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I have already looked at about 20 different topics on this forum alone about the same problem, however, some have no solution or I have tried it and it did not work. Most places just end up saying the same few things like reseting CMOS, or they have an obvious fault which the OP did not notice.

This is a 2nd hand pc I bought for only £30. Everything here (other than the R7 370 and 4650) came with a case I bought. They guy said his brother gave it to him to see if he could get it to work but he does not have the time to fix it.

Specs:

Motherboard: Asus Z87-A
Ram: 2x4GB Crucial Ballistix Sport
PSU: 700W Cooler Master (RS-700-ACAB-L3)
GPU(s): GTX 770, R7 370, Radeon HD 4650
CPU: No idea, it won't the PC won't post and I don't have any spare thermal paste to put back on it if I take it off.

I have no spare PSU, I would prefer to not take the board out of the case just to test it since it seems to work okay otherwise, but if you very much suggest it I can.

What happens:

The computer turns on, green motherboard light on and if I have the 770 in, the two lights indicating it is correctly plugged in are on too (green).

Next is the troubleshooting lights, first the RAM light, which blinks on then off once (It says lit when no RAM is installed). Next comes the CPU light, which again, blinks on the off. Then the CPU fan which has been running so far, stops, and starts again, what seems to be up to 100% then Idling again. While the CPU fan is doing this, the VGA_LED comes on and stays on. This is supposed to blink on and then off (lastly the Boot Device LED, which finishes the POST).

The screen at this point has done nothing, and is on standby. I have tried using the HDMI and VGA cable to the respective ports on the motherboard.

I can also see into the PSU from the bottom of the case and I can see the fan spinning inside it. Both case fans are running fine too.

What I have tried:

- Taking the GPU out and using the on board graphics.
- Reset CMOS.
- Try both stick of ram in every single slot one by one.
- Take every cable out other than the 20+4 & 8 power cables, then turn on the PC.
- (Risky I know) Take off the CPU cooler (stock) and CPU to check pins on the board and check the CPU for blemishes (all fine).
- Using different GPU's (Both R7 370 & Radeon HD 4650)
 
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wildcard1978

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Did yang also pull the main board battery and also clear the cmos and fugly discharge power from system when yang tried cmos . Capacitors hold juice in main board and power supply so when unplugged hold power button in for 10 to 15 secs to fully discharge
 
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wildcard1978

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If that ain't the issue is bad ram main board cpu or power supply and without another machine to test each part your going to have to borrows a friend's place and try parts one at a time . Or get a power supply to test it eCT.
 
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dideej848

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I took the battery out over night and had the jumper on 2-3 (instead of 1-2) for a solid 12 hours with no power going into the system.



RAM is brand new, and the troubleshooting lights for the RAM would come on if anything was faulty, but both sticks work fine. Like you said, I need to use a friends parts or get another machine. I am going to buy the cheapest (most crap) parts available simply for testing with.

On that note, do you know where I can pick up a stupidly cheap CPU that goes in this MOBO?
 
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wildcard1978

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Yah shouldn't of had to wait that long.
You tried reseating the ram and video cards I'm sure?
If yang did all that most likely bad psu or mainboard or ram.
Cpus usually the last thing that goes bad.
Sorry don't type well and new tablet I got ain't auto correcting right or hasn't learned enough words yet
 
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dideej848

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Tried all the RAM in every slot, all my GPU's in every slot. I'll look for another PSU and board. Thanks for the help.
 
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dideej848

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I only have one PSU I know that works, which is too old (<2010) to work. It's has no 2nd 4 pin connector for power the the board. (The top left power connection, near the CPU)
 
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dideej848

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When I took the CPU out to check, I didn't see a single bent pin (Thankfully). The board has a troubleshooting light to tell me if the CPU is working or not (it stays on if something is wrong), it blinks on an off no problem.
 
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wildcard1978

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But sometimes light won't always tell ya whats wrong if a parts is bad . Don't happen often. Same way if the board has error code beeps through a pc speaker ya can have a bad part and not get a single beep sometimes. Just saying
 
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wildcard1978

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Like I told email need to test it a part at a time. Only way to be sure.
 
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dideej848

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I seriously hope that's not it. But do you think a whole system could be fried (including the GPU) if that happened?



I don't have a motherboard speaker to test it with, sadly.

 
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junkeymonkey

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at me cant say you bought 2ed or 3ed hand that's all your risk on things ?/

''I don't have a motherboard speaker to test it with, sadly. ''

don't matter most of todays boards don't offer a system beep/ buzzer anymore or it can be disabled in the bios as well if it happens to have any and should be built in to the board so it can beep at bios with out anything attached to start with

its all about them led display code thing like asrocks drdebug or what ever your case may just be them '' idiot lights '' your going by now
 
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wildcard1978

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That and if board is fried and used error code beeps or power supply is bad or cpu sometimes still don't get beeps. Barrow a working psu out of a friend's system and least you'll no with working psu it ain't the psu and go from there
 
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junkeymonkey

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''CPU: No idea, it won't the PC won't post and I don't have any spare thermal paste to put back on it if I take it off. ''

you need to pull the cpu cooler and carefully remoe the paste from the chip to see what cpu you got in it should be that info stamped on the lid of the chip

thing is if he used a refresh cpu on that 8 series board he may not of updated the bios to support that cpu ?? with that off then you can check the socket pins and all

lot of guy don't get a haswell refresh cpu is not supported out of the box on 8 series and don't flash up to a supported bios before trying to use them in it

see info on the lid of chip in pic from here

http://images.bit-tech.net/content_images/2013/06/intel-core-i5-4670k-haswell-cpu-review/4670k-2-1280x1024.jpg
 
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wildcard1978

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In a case like that might need to barrow or snag a used older cpu just so ya can get it runNing to do a bios update.
 
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dideej848

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I bought all of this for £30, I only wanted to case in the first place, this just came with it. So anything I can get to work is a huge bonus.



Screw it, I will buy thermal paste and remove what is on here now and check it all again, then get back to you.
 
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wildcard1978

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Know the felling on my last build of a amd fx 9590 on a asrock 990fx extreme 6 mainboard. Had a weird voltage drop off issue on my ram. That was crashing my video card drivers non stop.geuse what upped ram voltage of my mothere board ram.05 volts and runs stable as he'll. Never seen mother board ram crash video card drivers like that ever, really really strange . Trouble shootings a pain the the Arse sometimes
 
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dideej848

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The CPU is an I7-4770K
 
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