I believe what made the difference was disabling the "Fast Startup" in Windows and then the full shutdown. Before that each time the Mint installer would get to the page where it would say "No OS detected" and selecting "Something else" would not enable to "Continue" button, so I was stuck. Unfortunately I had gone through several reboots trying various BIOS setting combos so I can't say for sure what I had been doing wrong before. So thanks again - just following these steps got me quickly up and running and now I'm dual-booting Mint and Windows 8.1
Here is the ixpi output:
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System: Host: Lappy-X200MA Kernel: 3.13.0-37-generic x86_64 (64 bit, gcc: 4.8.2)
Desktop: N/A Distro: Linux Mint 17.1 Rebecca
Machine: System: ASUSTeK (portable) product: X200MA version: 1.0
Mobo: ASUSTeK model: X200MA version: 1.0 Bios: American Megatrends version: X200MA.504 date: 11/13/2014
CPU: Dual core Intel Celeron CPU N2815 (-MCP-) cache: 1024 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 7466
Clock Speeds: 1: 931.00 MHz 2: 798.00 MHz
Graphics: Card: Intel ValleyView Gen7 bus-ID: 00:02.0
X.org: 1.15.1 drivers: intel (unloaded: fbdev,vesa) tty size: 148x37 Advanced Data: N/A for root
Audio: Card: Intel ValleyView High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
Sound: Advanced Linux Sound Architecture ver: k3.13.0-37-generic
Network: Card-1: Qualcomm Atheros AR9485 Wireless Network Adapter driver: ath9k bus-ID: 02:00.0
IF: wlan0 state: up mac: <filter>
Card-2: Realtek RTL8101E/RTL8102E PCI Express Fast Ethernet controller
driver: r8169 ver: 2.3LK-NAPI port: e000 bus-ID: 03:00.2
IF: eth0 state: down mac: <filter>
Drives: HDD Total Size: 500.1GB (1.1% used) 1: id: /dev/sda model: HGST_HTS545050A7 size: 500.1GB temp: 39C
Partition: ID: / size: 20G used: 4.9G (27%) fs: ext4 ID: /home size: 89G used: 446M (1%) fs: ext4
RAID: No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors: System Temperatures: cpu: 6280.0C mobo: N/A
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 150 Uptime: 1:09 Memory: 613.0/3840.5MB Runlevel: 2 Gcc sys: 4.8.2 Client: Shell inxi: 1.8.4