If you do have another drive that can boot Windows 7, you can use the Disk Management tool to build a new system partition on your existing SATA drive. You have to shrink the existing partition, and create a new partition. Then you can copy the boot files to the new partition using bcdboot.
An APU is an auxiliary power unit. On-board APUs are small jet turboshaft engines that are started to provide electrical and hydraulic power to the aircraft when needed during periods when the engines aren't running. Some aircraft are designed...
For those out of the loop, 'APU' is AMD's name for its processors, starting five years ago. These 'Advanced Processor Units' aim to combine genuine graphics processing right alongside the traditional CPU to deliver best possible performance on a single chip.