Mistakenly tried to boot pc without CMOS battery, won't boot with CMOS now

[fretovermsi]

I am building a new pc. I was having trouble booting from Samsung 950 pro (the computer was booting from another hard drive), so I removed the CMOS battery to clear bios settings. Unfortunately, I tried to boot the computer without inserting the CMOS battery (it was late in night, and I had gone 12 straight hours trying to get the NVME ssd to work). After realizing my mistake, I inserted the CMOS battery and tried to boot again. But the computer doesn't boot up now.
1. There's no signal to the monitor
2. CPU fans and system fans are running.
3. Hard drive is running.
4. Bios LED is ON. Thermal warning LED is OFF.

Things I have tried:
0. Rechecked the motherboard and CPU power connections. Removed and reinserted them.
1. I have two CPUs. Both were working before the CMOS battery incident. I replaced the CPU after the CMOS battery incident.
2. Power cycle reset: Remove power cord, and press power on button for 30 seconds.
3. remove and re-insert hard-disk, RAM, GPU
4. Try only one RAM stick
5. No RAM. Previously, if I didn't have RAM, computer would go into cycles of shutting-down and restarts. This time, the computer didn't respond to absence of RAM.

Is my mobo dead? Can running pc without CMOS battery damage the mobo?

Unfortunately, I don't have another power supply to test whether my power supply is not working.
Note all my parts except the CPU are new.
1. Mobo: MSI X99A SLI Krait Edition
2. CPU: i7 5820k
3. GPU: Geforce GT 610
4. PSU: EVGA 750W B2
5. RAM: 16GB stick (G.Skill Ripjaws)

What could I do to debug the PC? I did get a motherboard speaker. Unfortunately, the motherboard manual is not very clear about where to put the speaker. I did put the speaker in a slot which seems like the motherboard speaker slot. There are no beeps. Help please!

 

[Barty1884]

Attempting to boot without a CMOS battery shouldn't have any negative effects. Older motherboards could POST without it - you just wouldn't retain any BIOS settings. I haven't tried a board in a long time without a CMOS.

Have you breadboarded? Only the CPU + cooler, 1x RAM module & relevant PSU connectors? No GPU etc.

The motherboard speaker location does vary on boards, but generally should be part of the front panel connector layout on the board (where you attach your PWR LED, HDD LED, Reset etc). If you look closely, it should have 'speaker' on the PCB, corresponding with the location?

 

[fretovermsi]

Thanks for the quick reply!

I haven't breadboarded. I think that is my final option.

Yes, you are right about the speaker. The slot where I had inserted the motherboard speaker is near the front panel connection slots. I think my speaker doesn't work, because it didn't beep with a previous motherboard which I RMAd.

Let me check what all I need for breadboarding the motherboard. I don't have ammeter/voltmeters.

 

[darthvader30]

No, booting without the CMOS battery won't damage your mobo. I have an old system which boots fine without the battery. Maybe resetting the CMOS change the primary graphics to onboard, remove your GPU and use the onboard graphics and see if are able to boot.