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No signal to monitor, no POST beeps, fans and lights work, assuming mobo or cpu is shot.

Hi there, hoping someone smarter than I can lend me a hand here.

So, last couple days I've booted my computer up I've either been met with a black screen before it even gets to the mobo splash, or when I got a singal I was met with an "overclocking failed" message. Usually when I'd get the black screen, rebooting would get me the overclocking failure message the next time, after which I could reach the BIOS and boot into windows. After booting into windows, it would run fine all day.

Here are my specs:
Asus H87m-plus
MSI 970 4g
i5-4670k with the stock cooler and NO overclock done by me, maybe the BIOS does some automatically? (i have no idea)
2x4g kingston ddr3-1600
coolermaster 720W


Today, I have not been able to get any signal to the monitor, thus I have not made it as far as the BIOS. Considering what I've tried, my fairly uneducated opinion assumes that the problem lies either with my CPU or my motherboard. In addition, I picked up a mobo speaker today and have attached it to the motherboard, it has only beeped when I booted without any ram inserted.

Anyways, here is a list of things I've tried:

-tried a different cord, current is a DVI, other was a VGA that I know works, as it is currently being used for something else. The VGA cord is connected to my xbox one with an HDMI to VGA converter, I connected that to my computer's integrated graphics. Tried it both through the converter and directly to the mobo's VGA port.
-booted normally with the 970 connected, booted with the 970 removed and the DVI cable attached to the mobo for integrated graphics, and tried connecting my old 480 (which certainly still works)
-tried booting with an old psu i have sitting around, which I have no reason to believe has any problems as i used it in an older system. it's a silverstone zeus 650W
-tried swapping the RAM around, and tried booting with each stick singularly in the first slot
-tried clearing the cmos, through the jumper and removal of the battery, both separate and at the same time
-i've unplugged all the PSU cables and reseated them multiple times
-as mentioned above, I hooked up a case speaker today before trying anything and have only heard it beep when the ram was removed.
-when i was last in the BIOS, i switched it from asus optimal to normal

will edit if i'm missing anything I've done

This all results in no change. Upon booting the computer all the case fans run, the cpu fan runs, the gpu runs. The case light turns on; the DRAM led turns on solid briefly as usual; the light on the mobo is green. By all indications, everything seems to be receiving power.

If anyone has any insight, or ideas as to what I may have missed, it would be much appreciated. Like I mentioned, I am led to think it is either my mobo or cpu.

It is also probably important to state that this is NOT a new build. This setup has been running well for well over a year. The 970 was bought shortly after they were released and the computer was built only a while before that. Can't remember exact dates. The problems have arisen in the past few days and there weren't indications of these problems before that.

Thanks in advance, hopefully the post isn't too confusing.
2 answers Last reply Best Answer
More about signal monitor post beeps fans lights work assuming mobo cpu shot
  1. Best answer
    Try one more time with Bench it - Troubleshooting http://www.tomshardware.com/faq/id-1753671/bench-troubleshooting.html Start with cpu with cooler+ onboard iGPU+ one stick RAM, if the PC will not boot, the problem is from either cpu or MB. Then if you don't have compatible parts, and may ask your friend or even go to local PC shop too. But most likely the problem is from MB, because MB is easy to die. Also check the cpu to see it has any burn mark or not, and the cpu socket has bent pin or not, the capacitors on MB too, etc.
  2. cin19 said:
    Try one more time with Bench it - Troubleshooting http://www.tomshardware.com/faq/id-1753671/bench-troubleshooting.html Start with cpu with cooler+ onboard iGPU+ one stick RAM, if the PC will not boot, the problem is from either cpu or MB. Then if you don't have compatible parts, and may ask your friend or even go to local PC shop too. But most likely the problem is from MB, because MB is easy to die. Also check the cpu to see it has any burn mark or not, and the cpu socket has bent pin or not, the capacitors on MB too, etc.


    Yeah, I just did this and am about to call up a pc shop to see if they'd let me in for a quick test. Everything looks fine physically and no post with only mobo/cpu/ram.

    Thanks.
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