Yeah, I have an genuine 180W Dell PSU now.  So that's no longer an issue.  The memory seemed to be the cause of most of the problems, with that corrected, I'm just left with this not shutting down problem.  Hopefully I'll have that figured out soon.
Hi.  I have this Alienware 17 R3 = CPU: Intel i7-6700HQRAM: 8GB DDR4 (2x PC4-2400T 4GB SODIMM)OS: Windows 10 (fresh install from Microsoft ISO) Trying to get it running, but it has a variety of (apparently) connected issues: 1. The CPU only runs at 800MHz when on AC power. This is somewhat expected, as I'm running with a 120W PSU, rather than the suggested 180W.  However.... 2. The computer crashes instantly when switching to Battery power. CPU will run at full speed when solely on battery, for a few seconds, then blue screen with this message: WHEA UNCORRECTABLE ERROR 3. The computer will not shut down properly. When running from AC power at 800MHz, the computer will never shut down. The screen goes off, keyboard lights turn off, but the machine runs perpetually with fans at full tilt until battery dies or 4 second power button press forces it off.  This applies to blue screen crashes as well (like #2), it'll just sit on the crash screen until battery runs down. 4. Fans always run 100%. Even at 800MHz. It just always runs fans 100%. Very loud. I've tried reinstalling Windows from scratch a few times, but always getting this severe issues. As for drivers, I've tried two ways to remedy missing drivers: Windows update was tried once, this got all the missing drivers in. Still behaves as above. Reinstalled fresh Windows and then tried manually installing drivers using SnappyDrivers prior to any internet connection, but still behaves weird. Any ideas anyone?  
17 R3, crashes at full speed