Mostly No Signal Detected

[carolinawolverine]

I’ve got a several years old desktop that I build myself. Lately, it will power on (the fans all spin up), but the monitors will just sit at “no signal detected”.

In playing around with it a bit, I’ve noticed that if I power down, pull motherboard battery, wait 30 seconds, put it back in, and boot, some times it will come on and everything will work fine. Other times I have to repeat this five or six times before it will work.

Any idea what is broken here?

Build Details:
OS: Windows 10
Motherboard: ASRock B250M Pro4 Micro ATX LGA1151
CPU: Intel Core i7-7700 3.6 GHz Quad-Core Processor
Ram: G.Skill Aegis 32 GB (2 x 16 GB) DDR4-2133 CL15

I use the motherboard GPU, and typically run two monitors, one from HDMI, and the other from DVI.

Happy to provide any additional details that might be helpful.

Thanks in advance.

[PeterOz]

Try a new cmos battery.
Odd I know but I had a computer that did the same thing.

[carolinawolverine]

I did try that. Didn’t change anything…

[PeterOz]

Try one monitor only - hdmi.
Or can you borrow a gpu card from someone?

[carolinawolverine]

I have been working with only HDMI for troubleshooting, yes.

I actually purchased one on Amazon and installed it, but that didn’t fix it either.

[PeterOz]

From memory I never found a fix for mine.
I will ask for others to have a look
@Bruce @Evan Omo

[carolinawolverine]

It’s weird cause this computer has worked for years without issues. Really feels like the battery should have been it. Or I guess a failure somewhere (replace the motherboard?)

[Bruce]

I’d take it all apart and re-assemble on a piece of cardboard.
be a good chance to clean everything (boards, slots), check everything, re-do thermal paste.
does it have a speaker attached to the mobo so you can hear the POST beeps, in case they change when it does and doesn’t start?

[carolinawolverine]

I tried connecting a speaker, but didn’t hear anything. The speaker is powered by the USB port. Is there any chance that’s not up in time to get any beeps?

[Evan_Omo]

Hi,

I agree with Bruce. Re-assemble the whole system outside of the case and see what happens. I would try using one stick of RAM as well and if possible update the BIOS to the latest version too.

[carolinawolverine]

Thanks all. I’ll give that a try and report back.

[Bruce]

I tried connecting a speaker, but didn’t hear anything. The speaker is powered by the USB port. Is there any chance that’s not up in time to get any beeps?

yes there is a chance.
best to have one of these little speakers.

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[Bruce]

@carolinawolverine - any progress?

[carolinawolverine]

The computer is on, and the wife is using it, so I haven’t had a chance to take it down and give it a good cleaning/reassembly. Will probably come the next time it reboots…

[Bruce]

OK, keep us posted.