Computer turns on (Fans spin, mb beeps, leds light up) but no signal to monitor after changing bios settings

[Liekhue]

As the title goes.
This forum has helped me a lot in the past but this time I couldn't actually find anyone with the exact same problem so here goes.

Thing I did:
Changed bios setting for sata from AHCI to Native IDE

Because:
I needed to boot from a cd, the cd drive didn't show in the boot devices list and as I recalled that was the exact setting I had to change before when I needed to flash my hard drive sleep timer and now I needed to wipe my old Samsung ssd for a new one I had cloned it to.

Thing I did afterwards that might have made it worse:
Force shutdown when it was stuck in trying to boot from the old ssd into a bluescreen so I could unplug the new one (so I don't accidentally wipe it too/instead) and put in the boot cd.

Things I've tried:
Unplugging and replugging;
GPU, RAM, All sata devices (not replugged but that shouldn't matter), CMOS battery + power cord, switching monitors/video outs.

It was originally a G3620 prebuilt with some self brand motherboard, radeon HD 7870, i5-3550P and 16gb ram. The only thing different is that I've got a 1070 strix and an ssd+3 HDDS now in it really.

Also I don't really know what category to put this in, hope a mod moves it if it ends up in the wrong place.
So how do I fix it? Because it seems whatever I try I can't even get it to boot into bios.

 

[HowNowBrownCow]

What kind of motherboard do you have?

Many boards have a button to reset the BIOS to factory settings. How long did you remove the CMOS battery for? Guides recommend that after unplugging your computer, remove the battery for at least 5 minutes. You might as well give it a few more minutes anyway to be sure. That aught to reset your BIOS.

 

[Paul NZ]

Changing AHCI to IDE has nothing to do with a cd, it's for hdd's

And you shouldnt change it to IDE if you're using an SSD. And if you're installing Vista or higher

 

[Liekhue]

What kind of motherboard do you have?

Many boards have a button to reset the BIOS to factory settings. How long did you remove the CMOS battery for? Guides recommend that after unplugging your computer, remove the battery for at least 5 minutes. You might as well give it a few more minutes anyway to be sure. That aught to reset your BIOS.

The name of the motherboard is Acer G6320. I checked before when I was trying to fix it myself and didn't find any reset button on the back or board, now that I checked again I found a jumper hidden away called CMOS but since I had already removed the battery (For the third time) I didn't bother.
First two times I left it out for 30 minutes or so, this time an hour.
However, I might have misremembered but I was entirely sure that the motherboard had beeped and now that I tried it didn't. Only things connected are GPU, CPU, RAM and no beep (Though led/fans still work). Is the motherboard dead for sure then?