Windows – No display after CMOS and BIOS reset

I've got a very weird problem here, sorry to have such a specific case but I'm not sure what to do at this point.

So, this is for context I don't think it's related to the problem: I had this problem which was causing problems starting due to a Windows Update (Windows 10). Hadn't gotten around to fixing it because the temporary fix was "don't turn off the system."

Here's the real problem: I had a power outage. But the only thing that went wrong is, I couldn't boot to Windows. Couldn't boot to safe mode, but could boot to console (I could get to Windows's EUFI "troubleshoot" thing). Might've been due to the aforementioned problem, might've been because the power outage messed with BIOS. So, after examining the former, I thought I'd adress the possibility of a BIOS problem. Looked it up, and I turned off all power to the PC, and held the power button, in other words a flea power drain.

Seems pretty innocuous, but now my PC won't show a display at all. Unplugged my graphics card, tried integrated graphics. Still nothing. It's not my monitors because they worked before I did this (after the power outage). Then I took out the CMOS battery for 10 minutes, held the power button down for 30 seconds (while unplugged). Still nothing. But it posts, (at least the motherboard LEDs turn on, the fans spin, everything as you'd think it should be). The case speaker makes a barely audible ticking sound (not a full beep). I only installed it after getting the problem so I don't know if the ticking is normal.

Don't think my specs are relevant, got a custom-built PC. Will post specs if asked for.

So, I'm not asking for any help with the Windows problem, I'll figure that out later ;). I would just like to know, now what to get my display back?

TLDR: No display when booting. POSTs, no apparent hardware issues. Quick list of things that lead to the problem:

• Power outage caused (presumably unrelated) Windows problem
• Tried to fix by holding the power button down while unplugged (flea power drain… this resets BIOS, right?)

List of things I've tried to fix it:

• Took out CMOS battery, held power button down (while unplugged)
• Diagnosed and are in working order: monitor, graphics card, PSU. Motherboard LEDs turn on.

I'm at a loss, any help would be greatly appreciated, thanks!

EDIT: Added info on case speaker. It ticks.