I have a Lenovo L440 and a Lenovo X61. I want to install Debian Wheezy on thee L440. This morning, the L440 could successfully boot into Windows 8 from it's hard drive.

I created an installation of Wheezy on a USB flash drive with Unetbootin. I created an installation CD of Wheezy with Unetbootin. The X61 can successfully boot into the flash drive. The X61 does not have a CD drive.

I have attempted to boot from the live CD and the flash drive from the L440's boot menu. In both cases, the screen fades to black, and then returns me to the boot menu with no error message.

I removed the L440's hard drive, and installed it in the X61. I then successfully installed Wheezy onto the hard drive from the flash drive. I'm able to boot into the Wheezy hard drive on the L440. After replacing the hard drive into the L440. I booted from the hard drive from the boot menu. Once again, the screen fades to black, and then returns me to the boot menu with no error message.

What's the deal?