[SOLVED] No Video Signal After Replacing CMOS Battery

[Wfs0801]

Hi all, quick question:

So, a few months back I started having an issue where my desktop would boot into the BIOS, I would F10 to get into windows and find that my date/time was incorrect on the PC. This happened every time I booted the PC (I fully turn off the power supply and turn off the surge protector when I turn the PC off to save on power, it's just a habit). After some quick research, I found that this was probably caused by the CMOS battery on the motherboard going dead. Okay, no big deal. Seemed like an easy enough fix.

After a bunch of procrastination on replacing the battery and just dealing with the time/date being wrong, I finally replaced the battery last night. My motherboard (Asus ROG Strix Z370-E) happens to be a model that has the battery located directly under the PCI-e slot for the GPU (GTX 1080Ti). So I removed the CPU cooler (required to reach the latch to unlock GPU), unlatched and removed the GPU, replaced the battery, and put everything back in place. No big deal. No hiccups on reconnect. Everything snapped back in place without any issue.

Now, however, when I try to boot the PC I'm not getting any video signal to the monitor. I've tried using DP, HDMI, multiple monitors, and even tried using the motherboard's on-board display connections. Nothing gets a video signal to the monitor, no matter what. I've taken everything back apart several times, checked all wired connections, replaced the CMOS battery with the original + with a 2nd new one, and nothing seems to change. All fans turn on, all relevant LED's turn on (I think), everything appears to turn on like normal, but no video signal.

Is there anything else I'm missing? Is there something else I need to do when replacing the CMOS battery or another step I can try?

Please note, I'm not a huge tech guy. I built this PC, and have built a few in the past, but beyond the very basics I don't know much. So I apologize in advance if I ask for additional explanation on any possible solutions.

Thanks!

 

[Ralston18]

When you make changes within BIOS are you sure that you correctly and fully "SAVE", "OK", or "Yes" (as applicable) to confirm any such changes before exiting?

 

[DRagor]

Replacing the battery is as simple as it sounds. It should not cause any such problems. But, since you had to remove few components to reach it those actions could cause your problem.
Assuming your CPU has iGPU first thing to check would be to remove GPU, connect monitor to motherboard and check if you get video signal this way.

 

[Wfs0801]

When you make changes within BIOS are you sure that you correctly and fully "SAVE", "OK", or "Yes" (as applicable) to confirm any such changes before exiting?

Yes. Ever since the battery started going I would boot into a black screen that had me press F1 to go into BIOS settings, and then I would immediately press F10 to "Save & Exit" to windows. No changes were ever actually made. It was just the boot up process the PC required because of the battery.

 

[Wfs0801]

Replacing the battery is as simple as it sounds. It should not cause any such problems. But, since you had to remove few components to reach it those actions could cause your problem.
Assuming your CPU has iGPU first thing to check would be to remove GPU, connect monitor to motherboard and check if you get video signal this way.

Tried that as well. GPU is currently sitting on the side, not plugged into anything, and video connections are coming from the motherboard. Still no video signal.

 

[DRagor]

Tried that as well. GPU is currently sitting on the side, not plugged into anything, and video connections are coming from the motherboard. Still no video signal.

Looks like the motherboard may have a bigger problem then not working battery. Or maybe you have moved CPU when removing cooler?

 

[Ralston18]

This:

"I would boot into a black screen that had me press F1 to go into BIOS settings, and then I would immediately press F10 to "Save & Exit" to windows. No changes were ever actually made. "

So you never got to/get to see the BIOS setting screens? And could not make changes?

How long did you wait? But you did see the F1, F10 key prompts - correct?

 

[Wfs0801]

Looks like the motherboard may have a bigger problem then not working battery. Or maybe you have moved CPU when removing cooler?

I had considered the issue being the CPU moving, but even with the cooler removed there's a portion of the frame from the cooler that I never touched. That plus the locking arm mechanism that most motherboards have for the CPU was never touched. Regardless, I just opened it up to verify and the CPU looks fine. No bent pins or anything out of the ordinary.

 

[Wfs0801]

This:

"I would boot into a black screen that had me press F1 to go into BIOS settings, and then I would immediately press F10 to "Save & Exit" to windows. No changes were ever actually made. "

So you never got to/get to see the BIOS setting screens? And could not make changes?

How long did you wait? But you did see the F1, F10 key prompts - correct?

Sorry, just to be clear, the black screen/BIOS settings I would see was BEFORE replacing the battery. Ever since I opened the PC and changed the battery, I haven't seen these screens because I simply don't have any video whatsoever.

 

[Ralston18]

And two, new CMOS batteries were tried - correct? Were the batteries from the same pack/source?

Double check the battery installation - ensure that the batteries are correctly installed. Polarity.

Are you certain about the system specs and that iGPU (integrated graphics) is supported?

Take another look at the physical installation of all cards, connectors, RAM, and jumpers. Check by sight and by feel. Use a bright flashlight to take a close look at everything. May be a short somewhere. Or a bit of debris in the way....

Otherwise the issue may be, as suggested by @DRargo the motherboard/GPU.

 

[DRagor]

Also, additionally check if the old battery didn't leak.