Solved Trouble With PC At Boot. No BIOS. Looking for 2nd opinion.

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Don Muerte

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Trouble With PC At Boot. No BIOS. Looking for a 2nd opinion other than my own. Here's what I've done so far:

I was playing a game and then I got a Windows 10 bluescreen for the first time ever that said something "trouble with your PC" but then the system shutdown seconds later before I could read it. I assumed it was rebooting, but the video never loaded. Restarted the computer and still no video. Moved the monitor cables, unplugged one of them, plugged one into the DVI port of the board. No luck.
I then proceeded to pop the case and inspect things. I pulled the RAM and put one stick in to all of the slots one at a time and still nothing. Tried the other stick and no luck. Pulled the GTX 1080 and plugged into the Mobo directly, still no luck. No beeps of any kind to indicate RAM or otherwise issues. Finally I noticed there were LEDs flashing when I turned it on labelled "EZ Debug LEDs".

What I see is there are 4 LEDs: CPU, DRAM, VGA, and BOOT. When I press the power button, I quickly see the CPU LED lightup and turn off, then the DRAM light on and off, nothing at all from VGA and BOOT. Is this telling me my VGA is bad? If so, I wonder why both the Nvidia card and the mobo video went bad at the exact same time.

I have also cleared the CMOS with a jumper on JBAT1 and did a method where I removed the battery, pulled the power from the wall socket, and pressed power several times and booted with no NVIDA card and the monitor plugged into the onboard graphics, but it didn't help. I also reseated the CPU.

Hoping it was a bad motherboard, I ordered a replacement. I installed and I'm having the same issue. My logic leads me to believe the CPU is bad, but I really want another opinion before I spend upwards of 300 bucks that might not be refundable to replace it. Someone claimed PSU possibly, but it looks to me like the power boots up fine, but maybe I'm wrong?

Thanks for any help in advance.
 

Bruce

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Yeppoon, QLD, Australia.
while I'm only guessing, in my experience it's much more likely to be the PSU over the CPU.
CPU just don't fail (well, very very rarely). let's just say ion all my years, I've only come across one dead CPU to, hmmm, possible hundreds of PSU's.
it's that sort of ratio.

wouldn't hurt to look up the manual online for your mobo and see what the EZ debug LEDS stand for.
also, unless the mobo has an onboard speaker/buzzer or one attached to the speaker header on the mobo, you won't hear any beeps.
 
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Don Muerte

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vger, I removed the GPU completely and tried to use the DVi, HDMI, and VGA ports on the mainboard and nothing worked.

Bruce, I looked up the EZ Debug LEDs in the manual and couldn't find them at first, but apparently they should stay lit if they indicate a failure. I tested this by removing all the RAM and the DRAM LED stayed on and then the same with removing the actual CPU to get the CPU LED to stay lit. Not sure if that helps in anyway. I'm trying to work with EVGA to get an RMA going on the PSU right now.
 

phillpower2

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What are the brand and model name or number of both the CPU and the MB, reason I ask is that many MBs have video ports that will only work if the CPU has graphics on die.
 
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Don Muerte

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Thd board uses CPU graphics from what i read (MSI Z270 PC MATE) but the CPU is an i7-7700k which apparently has built-in GPU.
 

phillpower2

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You are correct in that both the board and CPU have graphics capability.

Unless I have missed it, I don`t recall reading anywhere in your thread that you have tried another screen only that you have tried the three different types of video port on the MB.

Do you have a notebook that you could connect to your screen to see if you get a display from the notebook to the external screen.
 
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Don Muerte

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I was using my second monitor to test while working on it. It's worth nothing that both monitors had black screen when it died. Also, i plugged the monitor into the 2nd port on my old computer and am using it currently.

I've been out of town so i haven't been able to test the psu fully yet, but I'll hopefully be able to do that tonight.
 

phillpower2

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Apologies, we had no way of knowing that you had been using two monitors.

The only way to rule out the present PSU is by swapping in a known good PSU of adequate power output, if everything works you know the original PSU is the culprit, if things stay the same the problem is elsewhere.

The attached video is the one that I use as an example to show the sort of equipment that is required to conclusively test a PSU.

What the equipment does is simulate a computer under load and so the PSU behaves as it would when it is powering your PC, multi-meters and the basic testing devices that you can purchase from some merchants only test the basic voltage output from the PSU rails and so cannot be relied on as 100% conclusive.



 
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Don Muerte

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No. Sorry. I've just been busy with work, holidays, family, etc. I'll hopefully have some free time this weekend.
 

Don Muerte

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I finally had some spare time to test my PSU in another computer and it booted that machine fine. I guess at this point it seems like my CPU is bad. Thanks for your help guys.
 

Don Muerte

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I went out and bought a cheap i3 to see if it was the CPU and sure enough, it's up and running now. Thanks for the help!
 

phillpower2

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While not an ideal outcome we are pleased to see that you have been able to resolve the issue and thank you for sharing the solution so that it may help others (y)

You are welcome btw :)
 
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