SIW2 and all here - With my success booting to both Win 10 and Win 7 on my original HDD, I again followed the amazing article to get my Optiplex 7010...
SIW2 - thanks very much for your encouragement to get that Legacy boot menu - I was able to get it following your hints and the BCDEdit / set article...
Dual boot - Win 7 Pro 64-bit and Win 10 Pro 64-bit
CPU:
Intel Core i5 3470 @ 3.2GHz
Motherboard:
Dell 0GY6Y8 - what would the Intel number be? - Q77 chipset
Memory:
16GB RAM DDR3 (Four x 4GB)
Graphics Card(s):
Intel HD Graphics (on the CPU)
Sound Card:
Realtek High Definition Audio - and Intel Display Audio
Monitor(s) Displays:
Dell E176FP - nothing fancy
Screen Resolution:
1280 x 1024 @ 60 Hz
Hard Drives:
Two 500GB WDC WD5000AAKX (SATA @ 6GB/sec)
- External WD My Book 1110 USB device
PSU:
What means PSU? I'm at sea level
Cooling:
Ice cubes
Keyboard:
Noisy
Mouse:
Micky
Internet Speed:
Verizon DSL @ 7Mbps down and 780kbps up
Antivirus:
Win 7 Avast Free - Win 10 Windows Defender for now
Browser:
Firefox only with lots of security drives my wife crazy
Other Info:
Also have an old but important XP SP3 machine still running - Optiplex 755 Desktop w 4GB RAM and Momentus XT hybrid HD-SSD 500 GB hard drive. Used the registry hack to get more updates through "XP Embedded" or "POS" so now the machine rings like a cash register and the CD drawer opens to give change.