I have this laptop (Samsung NP300E5C) which used to triple-boot Mac OS X, Windows (8) and Ubuntu (13.10)
They were all installed to separate partitions and were all booted using the Chameleon boot-loader, with all of their respective boot-loaders on their own partitions. Just now, I attempted to install a different flavour of Ubuntu (Xubuntu 12.04) over my existing one. (I have done this before, successfully)
The mistake I made though, was to boot the live CD in UEFI mode. I didn't really notice though so I just continued installing it normally as I would. (Format the old Ubuntu part. and install the new one onto that partition along with the GRUB boot-loader.)
When I restarted I noticed something devastating, the PC would not boot (start up then just switch off, like when you pull the power in the middle of the bios boot.), then, it restarted but this time showing all the available boot options. Only "ubuntu" was there. Selecting it has no effect, just a screen refresh, looks like it.
"Simple!" I thought to myself. "I'll just go into the BIOS settings and set it to legacy boot only, right?" WRONG. My BIOS settings are gone, just gone. Like "Press F2 but then the PC just dies-gone."
It's not the first time Ubuntu has done something to render my motherboard useless, it killed it a while back. The warranty people couldn't tell that it was me who broke it though since it seemed like a hardware problem but this time it's easy to see it's a software problem and I don't think they'll help me this time round.
But still, I am so confused and can't even understand what happened??
Thanks in advance to anyone who knows anything about this problem.