My computer parts:

• Gigabyte Z77X-D3H Rev1.1


• Intel i5-3570k


• Geforce GTX 660/iGPU


• Corsair LP 8GB RAM

A few days ago, after I had installed a new BIOS, my Ubuntu install just stopped booting. It would start, but then stop after a few rotations of the 'loading' circles. I thought I could just fix it by booting up a Live USB and running boot-repair, but on starting the Live USB, the same thing happened. I went into the BIOS and changed all the UEFI settings and made absolutely sure that UEFI was completely disabled, as per when I installed both Windows and Ubuntu. I tried re-flashing the BIOS and clearing the DMI data pool, removing the GPU and checking to see if it was a driver issue, checking every component that I could, even memorytesting even though Windows 7 still booted up correctly. I tried booting different OSes, such as Fedora and Ubuntu 12.10/13.04, and Debian, but the only OS that worked apart from Windows 7 was Ubuntu 10.04, but understandably (I think) I don't want it. I know it can't be the USB/HD/CDs I'm booting off as I tried many different devices and none worked with newer Linux kernels. I'm also pretty sure that its not GRUB, seeing as GRUB 2 is used in 10.04 as well as 12.04 etc. I'm not a total 'noob' with Ubuntu consoles but I'm still not good, so please try to keep the help simple. Thanks in advance.

--EDIT--

I have finally found the issue: it was not a hardware issue or BIOS problem, but the UEFI options in the BIOS that prevented any new version of Linux stop booting, even if you chose the legacy boot option in the boot options. All I had to do was switch to 'Legacy ONLY' in the BIOS settings and they now boot. I still am stumped by why UEFI is supported by 10.04 and possibly other older distros.