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Is it possible that the BIOS got corrupted by simply "applying setup defaults?"

HP Recommended
HP Compaq Elite 8300 Small Form Factor PC (ENERGY STAR)
Microsoft Windows 10 (64-bit)

Hi! I received this ancient computer, which is the HP SFF 8300, from a friend. I have been running this computer for a year now on Windows 7. I decided to upgrade it to Windows 10 using the Microsoft tool through USB. I accessed the BIOS, changed it to boot from the USB. The upgrade went smooth until i reboot and went again to the BIOS to change the boot sequence by selecting "apply setup default and restart". The computer restarted (CPU led light on, Fan spinning, Monitor NO display, keyboard has no power but the mouse has) and I was presented with a blank screen.

 

I already:

-Re-seated the CMOS battery while the PC is off, power cable unplugged (Waited 5 seconds. 1 hour. Whole day. No POST)
-Pressed and hold the CMOS reset button while the PC is OFF, power cable unplugged for 5, 10, 60 seconds still no post
-Tried to boot with 1 RAM, swap with the other and still no POST. both RAMs are working when i tested it with my other PC
-Removed the video card and use the MB VGA still no POST
-I tried the Windows key + B combo but i don't think the keyboard is receiving power

 

I took the CMOS battery from my other PC and plugged it to the SFF 8300 and when i pressed the power button the LED blinks 8 times with 8 beeps. And after 3 sequence, i think, the beeping stopped but the led still blinks and the fan (front and rear) got really loud. Funny thing is it doesn't beep or blink when its default battery is plugged in.

 

Is it possible that the BIOS got corrupted by simply "applying setup defaults?"

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