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I can't think of any scenario where you could break the BIOS by doing an OS install. Something else is likely going on. If the OS install assumed you were UEFI when the system was not then what should have happened is a failed boot, since the drive would have been set as GPT by the installer. We have seen issues where the time allotted to hit the BIOS entry key is set to zero which makes it very difficult to enter the BIOS, but the Acer splash screen should still appear while POST is active. Try, from a powered off state, pressing and holding the F2 key, then turn it on and keep the key held down until you get the BIOS screen. Removing the HDD should have allowed the normal timeout for the F2 key press, so I don't really expect this to work any better, but who knows?
>>> but the Acer splash screen should still appear while POST is active
I don't think so. There's no Acer logo on boot, just a black screen.
>>> Try, from a powered off state, pressing and holding the F2 key, then turn it on and keep the key held down until you get the BIOS screen. Removing the HDD should have allowed the normal timeout for the F2 key press >>>
I turned it on and hold F2 down, also unpluged the HDD, but no luck.
Press FN+F6 and/or FN+F5 to try to turn the screen on.
>>>Last week, I installed FydeOS with the rEFind option on my laptop.>>>
Was FydeOS & refind on the same boot stick?
I tried them but nothing either.
Yes, they were on the stick.
>>>There's no Acer logo on boot, just a black screen.>>>
Are you sure there's no cursor or blinking cursor in upper left corner? Is screen brightness turned up to maximum ?
I'm pretty sure that i set the brightness to max and no cursor or a blinking cursor.
I suggest you unplug all hard drives and ssds and then check if the computer turns on properly.