I recently had my Aspire S3 repaired by Acer after my 500 GB HDD went bust. All fine and dandy, they returned it within a month with a new HDD, updated BIOS and Windows 8 installed. Since I already had Linux Mint installed, I wanted to reinstall it, from a live USB. First entered BIOS, set it to Legacy mode and booted from USB. Within the Mint installation, I deleted all partitions on both my SSD and my HDD, although maybe I should've left an EFI partition on either one. Thought that didn't matter since I installed from Legacy mode instead of UEFI.
With everything installed, I rebooted. Then, nothing happened. Several tries later, nothing continued to happen.
I have tried every single boot order, both in UEFI and in Legacy mode, I have tried both USB ports, I have created a new live USB-drive a few times but nothing works. When booting in Legacy mode, I get a blinking cursor in the upper left of a black screen, when booting in UEFI mode it tells me "no bootable device". What did I do wrong? I'm inclined to think it might have something to do with Secure Boot, which I didn't - and now cannot - disable.
I read somewhere that I might have had to disable it through Windows 8, which I didn't do because I didn't need to the previous time I installed Mint. I've already tried setting a BIOS password, but the only option it doesn't allow me to disable is Secure Boot. I'm at my wits end now... I would like very much to be able to boot from something... Any help is very much appreciated, as I'm truly becoming terribly frustrated with this. Thanks. 
